Page 2 - Best Thyroid function tests (including T3, T4, TSH) doctors: TOP 85 doctors

Dr. Anton Luger is a Professor of Medicine and leads the Department of Endocrinology and Metabolism at Vienna Medical University. He has published over 300 peer-reviewed articles in clinical, basic, and translational endocrinology.

Dr. Luger has served as President of the Endocrinology Section of the European Union of Medical Specialists. He has also held board positions in the Austrian Society of Endocrinology and the Austrian Diabetes Society. He is known for his work in improving endocrine research and medical care in Europe.

Education and Specialization

• Hacettepe University Faculty of Medicine – English Medical Education
• Akdeniz University Faculty of Medicine – Internal Medicine – Residency
• Akdeniz University Hospital – Nephrology – Subspecialty Training
• San Bortolo Hospital, Vicenza, Italy – Critical Care Nephrology and Transplantation – Fellowship
• Hacettepe University Faculty of Medicine – Associate Professorship

Professional Memberships

1. Turkish Society of Nephrology (TND)
2. European Society of Nephrology (ERA-EDTA)
3. Middle East Society of Organ Transplantation (MESOT)
4. International Society of Nephrology (ISN)

Dr. A.S. Ilana Itzhakov is an endocrinologist at Ichilov Medical Center (Tel Aviv Sourasky Medical Center).

Dr. Hakan Duger is a specialist in Endocrinology and Metabolic Diseases. He has worked at Gaziantep Özel Defa Life Hospital since 2023. He previously served at Kilis Prof. Dr. Alaeddin Yavaşca State Hospital from 2021 to 2023.

Education and training: Gazi University Faculty of Medicine (2006–2012). Internal Medicine residency at Uludağ University (2012–2017). Endocrinology and Metabolic Diseases training at Ankara Numune Training and Research Hospital (2017–2018) and Ankara Dışkapı Yıldırım Beyazıt Training and Research Hospital (2018–2021). He also served as an Internal Medicine specialist at Şanlıurfa Mehmet Akif İnan Training and Research Hospital (2017–2019).

Professional memberships: Turkish Medical Association. Turkish Society of Endocrinology and Metabolism. Turkish Diabetes Association. Clinical Endocrinology and Diabetes Association.

Dr. Saban Sec is a medical oncologist with experience at leading hospitals, including Haseki Training and Research Hospital, Prof. Dr. Cemil Taşcıoğlu City Hospital, and Bahçelievler Medikalpark Hospital. He currently represents specialist physicians in the Turkish Medical Oncology Association. He is also a member of the Istanbul Medical Chamber and the Turkish Medical Oncology Association.

Dr. Sec treats breast, lung, gastrointestinal, prostate, urogenital, head and neck cancers, as well as sarcomas and rare tumors. He has published many peer-reviewed articles on cancer prognosis, treatment outcomes, and survival rates. His research includes studies with large patient groups, such as 138 patients with HER2-positive metastatic gastric cancer. Dr. Sec focuses on prognostic factors and treatment responses in different cancers. He is dedicated to improving cancer care.

Education and Expertise

(1994 – 2000) - GATA Faculty of Medicine Ankara

(2003 – 2007) - GATA Medical Faculty Pediatrics and Diseases

(2008 -2011) - Ankara University Pediatric Endocrinology

(03.03.2014) - Associate Professorship, Pediatric Endocrinology

(17.07.2019) - Professorship, Istinye University Faculty of Medicine

Experience

(2001 – 2003) - Special Forces Command/Ankara

(2007 – 2008) - Etimesgut Military Hospital/Ankara

(2011 – 2013) - GATA Medical Faculty Hospital/Ankara

(2013-2015) - GATA Haydarpasa Training Hospital/Istanbul

(05.2015-09.10.2017) - May 2015-09.10.2017 - Süleymaniye Gynecology and Pediatrics Training and Research Hospital/Istanbul

(07.2015 – 01.2016) - Suleymaniye Gynecology and Pediatrics Training and Research Hospital Pediatrics Administrative Responsibility/Istanbul

01.2016 - 09.11.2017 - Suleymaniye Gynecology and Pediatrics Training and Research Hospital Pediatric Clinic Education Responsibility / Istanbul

(03.03.2016 - 30.10.2017) - Süleymaniye Gynecology and Pediatrics Training and Research Hospital Management

(2017-2020) - Istinye University Faculty of Medicine Faculty Member

(2020-Present) - Istanbul Aydın University Faculty of Medicine Faculty Member

(20.10.2020-Present) - Head of Department of Child Health and Diseases, Faculty of Medicine, Istanbul Aydın University

Courses and Certificates

2001 - Flight Doctor Course

2010 - Project Management Training Course

2013 - Basic Epidemiology course

2018 - Trainer Training Course

Professional Memberships

Pediatric Endocrinology and Diabetes Association

European Society of Pediatric Endocrinology (ESPE)

Istanbul Medical Chamber

Awards

İhsan Turan, Ian Hutchins, Bülent Hacıhamdioğlu, Leman Damla Kotan, Fatih Gürbüz, Mehmet Taştan, Ayça Ulubay, Eda Mengen, Bilgin Yüksel, Susan Wray, Ali Kemal Topaloğlu. CCDC141 Mutation in idiopathic hypogonadotropic hypogonadism. XVI. First Prize in Oral Presentation at the National Pediatric Endocrine and Diabetes Congress.

Bülent Hacıhamdioğlu, Gönül Öçal, Merih Berberoğlu, ZeynepŞıklar, Ercan Tutar, Suat Fitöz, Gökhan Nergizoğlu, Şenay Savaş Erdeve, Emine Çamtosun. Control of premature microvascular aging and cardiovascular performance in obese adolescents. XVI. was held in Samsun on 6-10 November 2012. Second Prize in Oral Presentation at the National Pediatric Endocrine and Diabetes Congress.

Z. Siklar, G. Ocal, M. Berberoglu, B. Hacıhamdioğlu, Ş. Savas Erdeve, Y. Egin, N. Akar. Control of hypercoagulability caused by obesity in children with endothelial microparticle level and thrombin generation test, and the relationship between risk and metabolic parameters. First Prize in Oral Presentation at the 55th Turkish National Pediatrics Congress held in Antalya on 12-16 October 2011

Z. Şıklar, V. Topçu, P. Kocaay, M. Berberoğlu, B. Hacıhamdioğlu, S.S. Erdeve, H.R. Ilgin, A. Tükün, G. Öcal. Clinical Characteristics of Our Cases with Mutation in the Androgen Receptor Gene. XVI. was held in Samsun on 6-10 November 2012. First Prize in Oral Presentation at the National Pediatric Endocrine and Diabetes Congress.

Dr. Philipp Riss leads the Surgical Endocrinology Working Group at the Medical University of Vienna. He specializes in general and visceral surgery. Dr. Riss is known for his expertise in thyroid and neuroendocrine tumor surgery. He has made important contributions to the field of endocrine surgery.

Dr. Riss received the Venia Docendi Award in 2017 and the Sandoz Award for Thyroid Research in 2010. He has organized international congresses and published many scientific papers. He is a member of respected organizations, such as the European Society of Endocrine Surgeons and the International Society of Surgery.

Dr. Viola Fox is the Chief Physician at the Clinic for Haematology, Oncology, and Palliative Medicine at BKZ Solingen. This clinic is a certified interdisciplinary cancer center. Dr. Fox is a leading expert in drug therapy for tumor diseases in Germany and Europe. She has more than 15 years of experience in this field.

She is a member of the German Society of Oncology and Haemato-oncology (GDHO), the German Association of Physicians, and the American Association for Cancer Research. Dr. Fox is also active in molecular biology research. Her work supports progress in cancer treatment and molecular diagnostics.

Her main areas of expertise are chemotherapy, immunotherapy, targeted therapy, and radiation therapy. Dr. Fox is known for her innovative methods and strong commitment to patient care. Her efforts have led to high recovery rates and recognition from her peers.

Dr. Séverine Iborra is the Chief Physician of the Department of Gynecology and Obstetrics at Städtisches Klinikum Solingen. Her responsibilities include obstetrics, the delivery room, the neonatal unit, and gynecology. The department also includes the Senology/Breast Clinic at the Bergisches Breast Center Solingen, led by Dr. Manuela Seifert.

Dr. Séverine Iborra is originally from France. She began her medical studies at the University of Lyon and later transferred to Albert-Ludwigs University in Freiburg, where she received her medical license in 2007. She earned her doctorate in 2008 for experimental research in molecular oncology. From August 2008 to November 2013, Dr. Iborra worked as a resident at the University Women’s Clinic in Freiburg. After passing her specialist exams in gynecology and obstetrics, she continued her career as a specialist at the same clinic. In November 2015, she moved to RWTH University Hospital Aachen as a senior physician.

At the Clinic for Gynecology and Obstetrics, under the leadership of Prof. Dr. E. Stickeler, Dr. Iborra led the obstetrics department from 2017 to 2019. Since December 2017, she was responsible for organizing education in the department, and in October 2019, she became the Managing Senior Physician and Personnel Senior Physician of the clinic, a position she held until she moved to Solingen.

In addition to her scientific work, with numerous publications and presentations at major gynecological conferences, Dr. Iborra deepened her medical specialties. She obtained certifications in oncological diagnostics and therapy from the Gynecological Oncology Working Group, as well as additional qualifications in Cervical Pathology and Colposcopy (AGCPC), Urogynecology and Pelvic Reconstructive Surgery (AGUP), and the Professional Association of Gynecologists (BVF).

In 2019, Dr. Iborra successfully completed further specialization in “Gynecological Oncology” and “Special Obstetrics and Perinatal Medicine.” She is an active member of leading German medical societies in her field, including the German Society for Gynecology and Obstetrics, the Cervical Pathology and Colposcopy Working Group, and the German Society for Prenatal and Birth Medicine.

Treatments Offered in Our Gynecology Department

• Hysteroscopy and Dilation and Curettage (D&C) for diagnostic and therapeutic purposes.
• Removal of abnormal or symptomatic ovarian findings, such as cysts, while preserving the remaining ovary.
• Oophorectomy (removal of ovaries) in cases of abnormalities or preventively when indicated.
• Myomectomy (removal of uterine fibroids) while preserving the uterus.
• Conservative treatment of fibroids: either medication or embolization performed by radiology specialists.
• Hysterectomy with or without removal of the cervix.
• Diagnosis and clarification of unclear findings in the cervix, vagina, and vulva.
• Dysplasia treatment.
• Endometriosis management.
• Cancer treatment for vulvar, vaginal, cervical, uterine, and ovarian cancers.
• Treatment for incontinence and/or pelvic organ prolapse.

Whenever possible, we offer all procedures as minimally invasive treatments using laparoscopy or the Da Vinci robotic system.

Lee Ji Hyun, MD, is a breast and thyroid surgeon. Dr. Lee is Head of Breast and Thyroid Surgery at Naeun Hospital. Clinical focus includes benign breast disease, breast cancer, and tumor surgery. Additional areas include benign thyroid disease, thyroid cancer, and parathyroid disorders. Skills include Mammotome procedures, axillary node management, and breast and thyroid ultrasound.

Education and training: Yonsei University College of Medicine. Internship and general surgery residency at Yonsei University Severance Hospital. Short-term clinical training at the Affiliated Hospital of the Cancer Research Institute in Japan.

Key roles: Chief of General Surgery at Incheon Christian Hospital and General Surgery Specialist at Cheil Hospital. Director of the Breast Center and Chief of the Department of Surgery at Samsung Cheil Hospital. Chief of General Surgery and Deputy Director of Clinical Services at Cheil Hospital. Outpatient Professor of Surgery at CHA Gangnam Medical Center, CHA University. Chief of General Surgery at Daejeong Hospital.

Dr. Victor Alexander Krol - Chief of Gastroenterology, Internal Medicine and Obesity Treatment Center at Martinus Hospital

Dr. Victor Alexander Krol is a highly qualified specialist, heading the departments of gastroenterology and internal medicine. With many years of experience and deep knowledge in his field, Dr. Krol has established himself as an outstanding expert, providing patients with comprehensive treatment and an individual approach. He actively uses the latest methods of diagnosis and treatment of diseases of the gastrointestinal tract, metabolism, as well as diseases of the cardiovascular and respiratory systems.

Dr. Krol is also the director of the certified Obesity Treatment Center at Martinus Hospital, which provides surgical and endoscopic treatments for obesity. The center uses advanced technology to diagnose and treat obesity (adiposis), including methods such as bariatric surgery, endoscopic weight loss, and specialized programs for patients with different stages of obesity. The center is certified to high standards and has excellent results in the treatment of this serious disease.

The Gastroenterology Department, headed by Dr. Krol, diagnoses and treats diseases of the stomach, intestines, liver, pancreas, and gallbladder. The doctors of the department use a wide range of methods, including endoscopic procedures, ultrasound, and other modern diagnostic technologies.

The Department of Internal Medicine covers a wide range of diseases, including cardiology, diabetology, infectology, and therapy of respiratory and renal diseases. Dr. Krol and his team provide a comprehensive approach to treatment using the most advanced methods of medicine.

Thanks to his high professionalism and humane approach to each patient, Dr. Krol deservedly enjoys the respect of colleagues and patients.

Education:

• Degree: Faculty of Medicine, Trakya University, 2009
• Medical Specialty: Internal Medicine, Bakırköy Dr. Sadi Konuk Training and Research Hospital, 2010-2014
• Specialist Doctor: Internal Medicine, Kanuni Sultan Süleyman Training and Research Hospital, 2014-2019
• Specialist Doctor: Internal Medicine, Turkish Hospital Internal Medicine Clinic, Qatar, 2019-2020
• Specialist Doctor: Internal Medicine, Istanbul Medipol University Hospital Mega Hospital Internal Medicine Department, 2020-2024
• Associate Professor Doctor: Internal Medicine, Istanbul Medipol University Medipol Acıbadem Regional Hospital, 2024-Present.

Roles in Projects:

Sub investigator (Assistant Researcher) in the SOUL Study: Cardiovascular Outcome Research of Semaglutide in Type 2 Diabetic Patients, approved by the Turkish Medicines and Medical Devices Agency on May 22, 2019.

Sub investigator (Assistant Researcher) in the international study “SCALE™ Insulin”: Efficacy and Safety of Liraglutide 3.0 mg in Overweight or Obese Patients with Type 2 Diabetes Treated with Basal Insulin (Study Code: NN8022-4272), conducted by Novo Nordisk A.Ş.

Subinvestigator (Assistant Researcher) in the international study NN5401-4266 StepByStep Intensification conducted by Novo Nordisk.

Assistant Researcher in the study "A Research Study to Compare Semaglutide to Insulin Aspart, When Taken Together With Metformin and Insulin Glargine, in People With Type 2 Diabetes (SUSTAIN 11)" (2019-2020).

Assistant Researcher in the PIONEER 1 study: Randomized Clinical Trial of the Efficacy and Safety of Oral Semaglutide Monotherapy in Comparison With Placebo in Patients With Type 2 Diabetes.

Associate Professor Dr. Yusuf AÇIKGÖZ
Specialization: Medical Oncology

Education:

• 2004-2011: İnönü University Faculty of Medicine
• 2011-2016: Ankara Numune Training and Research Hospital, Internal Medicine
• 2017-2022: Health Sciences University, Medical Oncology

Professional Experience:

• 2016-2017: Bingöl City Hospital, Internal Medicine
• 2021-2022: Health Sciences University, Medical Oncology
• 2022-2023: Kastamonu Education and Research Hospital, Medical Oncology
• 2023-2024: Ohio State University, Medical Oncology
• 2024-Present: Lokman Hekim University, Medical Oncology, Ankara Hospital

Clinical Trials, Courses, Certifications:

Clinical Trials:

• 2017-2021: Phase III, CheckMate-649 Study (Assistant Investigator)
• 2022-Present: Phase III, Fortitude-101 Study (Assistant Investigator)

Courses:

• 2018: Medicres Basic and Advanced Biostatistics Training Program (ongoing), Istanbul-Vienna
• 2019: Immuno-Oncology Education Course, March 1-2, 2019, Vienna, Central European Cooperative Oncology Group (CECOG)
• 2018: Good Clinical Practice Certification, April 7-8, 2018, Ankara, Health Sciences University
• 2017: Basic Oncology Training Program, November 25-26, 2017, Adana, Clinical Oncology Society
• 2016: Basic Ultrasonography Course (10 hours theoretical + 10 hours practical), September 24-25, 2016, Ankara, Turkish Emergency Medicine Association

Certifications:

• Ongoing: ECFMG Certification
• 2024: CITI Responsible Conduct of Research (The Ohio State University)
• 2024: CITI IACUC-Laboratory Animal Research (The Ohio State University)
• 2024: CITI Human Subjects Protection (The Ohio State University)
• 2024: CITI Good Clinical Practice (The Ohio State University)
• 2023: Occupational English Test (OET)
• 2019: International English Language Testing System (IELTS), Total Score: 6.5, May 26, 2019, Ankara, British Council
• 2017: USMLE Step 2 CK Exam; Score: 244, February 7, 2017
• 2016: USMLE Step 1 Exam; Score: 215, August 25, 2016

Memberships:

• American Society of Clinical Oncology (ASCO) - 2022
• Turkish Society of Medical Oncology - 2020

Education

• 1986-1989, Bursa High School, Bursa, Turkey
• 1989-1995, Istanbul University, Istanbul School of Medicine, Turkey
• 1999-2003, (Residency) Kadir Has University, School of Medicine, Department of Radiation Oncology, Istanbul, Turkey
• 2015, (Associate Professor) Demiroglu Bilim University, Department of Radiation Oncology, Istanbul, Turkey
• 2021, (Professor) Demiroglu Bilim University, Department of Radiation Oncology, Istanbul, Turkey
• 2024, Istanbul Medipol University, Department of Radiation Oncology, Istanbul, Turkey

Experience

• 1995-1999, Şişli Florence Nightingale Hospital, Istanbul, Cardiology Department
• 2003, Gayrettepe Florence Nightingale Hospital, Istanbul, Department of Radiation Oncology
• 2015, (Associate Professor in Radiation Oncology) Demiroglu Bilim University, Department of Radiation Oncology, Istanbul, Turkey
• 2021, (Professor in Radiation Oncology) Demiroglu Bilim University, Department of Radiation Oncology, Istanbul, Turkey
• 2024, Istanbul Medipol University, Department of Radiation Oncology, Istanbul, Turkey

Education

Ondokuz Mayıs University Faculty of Medicine (1991)

KTÜ Faculty of Medicine Farabi Hospital (Specialization.1998)

Istanbul University Çapa Faculty of Medicine (Laparoscopic Surgery Training, 2002)

Istanbul University Çapa Faculty of Medicine (Laparoscopic Antireflux Surgery Training, 2006)

Istanbul University Cerrahpaşa Faculty of Medicine (General Surgery Clinic Advance Laparoscopic Surgery, Laparoscopic Bariatric Surgery, Morbid Obesity and Oncological Cancer Surgery Training, 2010i)

Education and Expertise

• 2023 BAKIRÇAY UNIVERSITY ÇİĞLİ TRAINING AND RESEARCH HOSPITAL (ASSOCIATE PROFESSOR)
• 2021 EGE UNIVERSITY FACULTY OF MEDICINE GASTROENTEROLOGY DEPARTMENT
• 2017 EGE UNIVERSITY INTERNAL MEDICINE DEPARTMENT
• 2010 EGE UNIVERSITY FACULTY OF MEDICINE

Diseases

• Liver Diseases
• Digestive System Diseases

Treatment Methods

• Endoscopy
• Endoscopic mucosal resection – EMR
• Endoscopic Obesity Treatment (Intragastric Botox, Intragastric Balloon)
• Endoscopic Polypectomy
• Endoscopic Retrograde Cholangio Pancreatography (ERCP)
• Liver Transplant
• Colonoscopy
• Peroral Cholangioscopy

Experience

• Diyarbakir 112 Emergency Health Services Chief Physician (2010-2011)
• Ege University Faculty of Medicine, Department of Internal Medicine (2012-2017)
• Ayvalik State Hospital (2017-2018)
• Ege University Faculty of Medicine, Department of Gastroenterology (2018-2021)
• Burdur State Hospital (2021-2022)
• Bakırçay University Çiğli Training and Research Hospital (2022-2024)

Professional Memberships

• 1.Turkish Gastroenterology Association (ERCP working group)
• 2. Turkish Liver Research Association
• 3. Turkish Medical Association

Dr. Tülay Omma, Associate Professor

Specialization: Endocrinology and Metabolic Diseases

Academic Background

• Medical Education: İnönü University, Faculty of Medicine (English Program), 1994–2001.
• Internal Medicine Residency: Haseki Training and Research Hospital, 2004–2010.
• Subspecialty in Endocrinology and Metabolism: Ankara Training and Research Hospital, 2013–2017.

Professional Experience

• Clinical Expertise: 
  • General Practitioner with administrative responsibilities, 2002–2004.
  • Specialist in Internal Medicine during mandatory service, 2010–2013.
  • Endocrinologist and Metabolic Disease Specialist at Ankara Training and Research Hospital (2017–2023).
  • Earned the title of Associate Professor in 2023, reflecting her academic and clinical excellence.
    Lokman Hekim Health Group 2023 (present) 

Scientific Contributions & Publications

• Research Output: 
  • Published over 20 articles in peer-reviewed international journals, with a strong focus on diabetes, thyroid disorders, and polycystic ovary syndrome.
  • Delivered numerous oral presentations and posters at national and international conferences.
• Citation Metrics: 
  • Total Citations: 166
  • H-index: 6
  • i10-index: 4

Awards & Recognitions

• Multiple prestigious accolades, including: 
  • Best Oral Presentation Award (2023): For groundbreaking research on COVID-19 vaccines and Graves’ Disease.
  • Best Poster Award (2021): For clinical insights into hypoparathyroidism in Turkey (HiPOPARATURK-NET Study).

Professional Memberships & Certifications

• Active member of leading organizations: 
  • European Society of Endocrinology (ESE) and its Young Endocrinologists & Scientists Committee (EYES).
  • Turkish Society of Endocrinology and Metabolism.
• Completed numerous advanced training programs, including certifications in clinical trials, biostatistics, and thyroid ultrasonography.

Clinical & Research Focus

Dr. Omma’s expertise spans:

• Diabetes management and its complications.
• Advanced thyroid disease diagnosis and treatment.
• Polycystic Ovary Syndrome (PCOS) and its metabolic implications.
• Investigating the relationship between diet and endocrine/metabolic disorders.

Anyarat Vichayawannakul, M.D.

Expertise

INTERNAL MEDICINE / ENDOCRINOLOGIST AND METABOLISM 

Graduation (M.D. From)

Bachelor of Medicine, Faculty of Medicine, Chulalongkorn University (Second Class Honor)

Certificates

Diploma in Internal Medicine, Faculty of Medicine, Chulalongkorn University

Diploma in Endocrinology and Metabolism, Rajavithi Hospital, Department of Medical Services .

Current Positions

INTERNAL MEDICINE / ENDOCRINOLOGIST AND METABOLISM AT INTRARAT HOSPITAL

Education and Expertise

• 1989 BORNOVA ANATOLIAN HIGH SCHOOL
• UNDERGRADUATE DEGREE 1995 EGE UNIVERSITY/ FACULTY OF MEDICINE
• SPECIALIZATION IN MEDICINE 2001 DOKUZ EYLÜL UNIVERSITY/MEDICAL FACULTY INTERNAL MEDICINE DEPARTMENT
• MEDICAL SPECIALIST 2005 DOKUZ EYLÜL UNIVERSITY FACULTY OF MEDICINE ENDOCRINE AND METABOLISM DISEASES

Biography

Our doctor admits patients aged or older than 15.

Medical Education

School of Medicine, Ege University

Medical Residency

Department of Internal Medicine, School of Medicine, Dokuz Eylül University

Department of Endocrinology, School of Medicine, Dokuz Eylül University

Areas of Interest

Diabetes Mellitus

Thyroid Diseases

Pituitary Diseases

Hirsutism

Osteoporosis

Membership

Turkish Society of Endocrinology and Metabolism

Experience

• 2005-2009 Private Western Anatolia Central Hospital
• 2009-2011 Private Healing Hospital
• 2011-2016 Private Izmir Sifa University
• 2016-2023 Izmir Medical Point Hospital

Professional Memberships

• Turkish Medical Association
• Turkish Endocrinology and Metabolism Association

Dr. Ercan Ozden is a specialist in internal medicine and medical oncology. He earned his medical degree and completed his residency at Istanbul University, Cerrahpaşa Faculty of Medicine. He later received a subspecialty in medical oncology at Kocaeli University Faculty of Medicine from 2016 to 2020.

Dr. Ozden has worked in medical oncology at Şırnak State Hospital. He has also served as an internal medicine specialist at Bağcılar Private Safa Hospital and Küçükçekmece Batı Bahat Hospital. He has extensive clinical experience in both internal medicine and oncology.