Best Complex diagnostics of thyroid Doctors Worldwide — TOP 46

The doctor completed medical education at Istanbul University, Cerrahpaşa Faculty of Medicine, and conducted clinical studies at Baylor College of Medicine and The University of Texas Medical School. He passed the USMLE exams and obtained the ECFMG Certificate to practice in the USA. After returning to Turkey, he specialized in general surgery at Istanbul University and earned a diploma in Laparoscopic Surgery from the University of Strasbourg. He passed the European Board of Endocrine Surgery exam and is one of five surgeons in Turkey with this certification. The doctor has over 10 years of experience in laparoscopic and minimally invasive surgeries, performing over 2000 successful operations.

The doctor serves as the Chief Physician of the Otolaryngology, Head and Neck Surgery, and Plastic Surgery Departments at Solingen Clinic in Germany. Specializing in the sparing treatment of tumors in the head, neck, and upper airways, the doctor employs advanced techniques such as endoscopic operations through the nose and robotic interventions with incisions as small as 1 cm.

With over 11 years of surgical experience, the doctor is also an accomplished academic, contributing to 78 scientific publications. The doctor completed medical studies in the USA and Germany, and has held significant roles in various German medical institutions.

Dr. Gokhan Yilmaz is an experienced general surgeon with nearly 20 years in medical practice. He is known for his skill in complex surgical procedures. He earned his Master’s Degree from Istanbul University Çapa Faculty of Medicine. He completed his Doctorate in General Surgery at Okmeydanı Training and Research Hospital, one of Turkey’s leading institutions.

Dr. Yilmaz worked as a General Surgery Specialist at Zonguldak Atatürk State Hospital for 5 years. He then served at Sancaktepe Şehit Prof. Dr. İlhan Varank Training and Research Hospital for 3 years. In these roles, he managed a wide range of surgical cases. He also served as an Assistant Professor at Istanbul Medipol University, where he trained future surgeons and contributed to research.

Dr. Yilmaz is currently part of the General Surgery Department at Medipol University Pendik Hospital. He provides advanced treatments and high-quality patient care. His experience in state hospitals, research centers, and universities highlights his dedication to surgical excellence and patient safety.

The doctor graduated from Cerrahpaşa School of Medicine, Istanbul University in 1999 and completed a residency in Internal Medicine there in 2005. Further specializing in Endocrinology and Metabolic Diseases, the doctor completed a fellowship at Selçuk University in 2010 and achieved Associate Professorship in 2016.

Recognized for excellence in scientific research, the doctor received awards at the National Diabetes Congress and Selçuk University in 2014. With 42 international and 16 local scientific articles, the work has been cited 230 times. The doctor has contributed to 80 presentations and participated in numerous scientific projects, including those funded by TUBİTAK.

Clinical interests include diabetes, thyroid diseases, and hormone disorders.

Experience

• Resident physician at the Princess of Spain Hospital, Bellvitge (until December 1996).
• Scholarship from the Ciutat Sanitària i Universitària de Bellvitge (1997), focused on the treatment of type I diabetes.
• Physician in the Department of Internal Medicine at the Bellvitge Hospital (until March 1999).
• Endocrinologist at the Dr. Josep Trueta Hospital in Girona (until September 2000).
• Member of the medical staff of the Teknon Centre since 2002.

Education

• Degree in Medicine and Surgery from the University of Valencia (1992).
• Specialist in endocrinology and nutrition (since 1997).

Scientific activity

• Dissertation : "Study of the pituitary-adrenal axis in pituitary diseases."

Teaching

• Lecturer in Endocrinology and Metabolism at the International University of Catalonia.
• Participation in conferences and publications on diabetes and the pituitary-adrenal axis in national and international journals.

The doctor graduated from Istanbul University's Çapa School of Medicine in 1998 and completed a residency in Radiodiagnostics and Interventional Radiology at Cerrahpaşa School of Medicine in 2002. Specializing in Diagnostic Radiology and Teleradiology, as well as Interventional Radiology, the doctor has participated in 12 local and one international congress, contributing numerous oral and written presentations. The doctor has held positions at Hisar Intercontinental Hospital, Merzifon Air Hospital, Istanbul Emar Center, and Haseki Training and Research Hospital.

Dr. Erdem Turemen is an endocrinologist at Anadolu Medical Center in Istanbul. He has authored over 25 national and international medical publications. Dr. Turemen treats diabetes, obesity, and thyroid disorders. He also manages complex diseases of the pituitary and adrenal glands.

• Specializes in Type 1 and Type 2 diabetes management.
• Treats endocrine-related cancers including thyroid and adrenal tumors.
• Performs thyroid biopsies and subtotal thyroidectomy procedures.
• Works at Anadolu Medical Center, a Top 10 global hospital by MTQUA.

Dr. Asaf Oren is a Senior Physician at the Dana-Dwek Children's Hospital in Tel Aviv. He specializes in pediatric endocrinology and diabetes management. Dr. Oren focuses on treating thyroid disease, adrenal adenomas, and type 2 diabetes in children. He practices at Sourasky Medical Center, ranked among the world’s top hospitals by Newsweek.

• Completed a pediatric endocrinology fellowship at The Hospital for Sick Children in Toronto.
• Clinical instructor at the Sackler School of Medicine, Tel Aviv University.
• Lectures internationally on pediatric medicine at the University of Toronto.
• Manages hormonal conditions using bioidentical hormone replacement and metabolic therapy.

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

Dr. Ilana Itzhakov is an endocrinologist at Sourasky Medical Center (Ichilov). She specializes in treating thyroid disease, diabetes, and chronic adrenal insufficiency. She completed her medical training at the National University in the USA. Dr. Itzhakov also treats pediatric diabetes at one of Israel's largest multidisciplinary clinics.

• Specializes in thyroidectomy and radioiodine therapy.
• Provides bioidentical hormone replacement therapy (BHRT).
• Develops new treatments through endocrine system research.
• Works at Ichilov, a Newsweek-ranked top 10 clinic for medical tourists.

Dr. Naomi Vayntrub heads the Pediatric Endocrinology and Metabolism Department at Sourasky Medical Center. She treats children with diabetes, growth pathologies, and thyroid disorders. Dr. Vayntrub trained at the Children’s Hospital at the University of Toronto. She also teaches medical students at Tel Aviv University.

• Specializes in genetic growth disorders like pituitary dwarfism and Turner syndrome.
• Treats complex conditions including hermaphroditism and adrenal cortex dysfunction.
• Manages pediatric obesity and its links to high blood pressure.
• Works at Sourasky Medical Center, ranked among the world’s top hospitals by Newsweek.

The doctor is a leading Austrian endocrine and general surgeon, recognized internationally for expertise in thyroid, parathyroid, and adrenal gland surgery, as well as research in endocrine oncology. The doctor graduated from the University of Vienna in the 1990s and completed a residency in general and visceral surgery at the Medical University of Vienna. Specializing in endocrine and metabolic surgery, the doctor performs advanced minimally invasive procedures.

Currently serving as a senior consultant at Wiener Privatklinik and Vienna General Hospital, the doctor focuses on endocrine oncology and precision surgical therapy. Widely published, the doctor contributes to shaping European standards in endocrine surgery and actively mentors future surgeons.

Dr. Naftali Shtern is the Director of the Institute of Endocrinology at Tel Aviv Medical Center. He specializes in diabetes, thyroid disorders, and endocrine hypertension. Dr. Shtern completed his clinical fellowship at UCLA in California. He practices at Sourasky Medical Center, ranked among the world's top 10 clinics by Newsweek.

• Served as Chief of Endocrine-Hypertension and Chief of Diabetes Service at UCLA.
• Holds a full Professorship of Medicine at the Sackler Faculty of Medicine.
• Treats complex conditions including pituitary adenomas and adrenal tumors.
• Expert in hormone replacement therapy and radioiodine treatments.

Dr. Uri Eal is the Director of the Department of Pediatric Neuroendocrinology at Dana-Duak Children's Hospital. He specializes in juvenile diabetes and endocrine disorders. Dr. Eal completed two internships at the Children's Hospital in Cincinnati, Ohio. He works at Sourasky Medical Center, ranked among the world’s top hospitals by Newsweek.

• Directs the Endocrine and Juvenile Diabetes Clinic at Dana-Duak Children's Hospital.
• Authored 30 professional publications and presented at 30 scientific conferences.
• Serves as a Senior Clinical Lecturer at the Sackler Faculty of Medicine.
• Treats complex conditions like adrenal adenoma, thyroid disease, and type 2 diabetes.

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.

The doctor is a leading expert in endocrinology, diabetology, and metabolic diseases, recognized for pioneering research and leadership in internal medicine. With a medical degree from the University of Vienna and specialization at Vienna General Hospital, the doctor has focused on diabetes, pituitary and thyroid disorders, and neuroendocrine tumors.

As Professor and Head of the Division of Endocrinology and Metabolism at the Medical University of Vienna, the doctor led a top center for hormonal disorders. The doctor has published extensively on diabetes management and hormonal therapies, contributing to international clinical trials.

Currently, serving as Senior Consultant at Wiener Privatklinik, the doctor remains active in research and mentoring, influencing modern hormone therapy and diabetes management in Austria.

Education and Experience

• 1992 - 1998, Gaziantep University, Faculty of Medicine
• 2002 – 2015, Cumhuriyet University, Faculty of Medicine, Department of Internal Medicine
• 2015 – 2024, Bağcılar Medipol Mega University Hospital
• 2024 – Present, Medipol Acıbadem Hospital

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.

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.