Page 4 - Best Colonoscopy doctors: TOP 149 doctors

The doctor is a leading specialist in general, visceral, and oncologic surgery, with international recognition for expertise in esophageal and gastric cancer surgery. Specializing in minimally invasive and robotic techniques, the doctor has made significant contributions to translational cancer research, modernizing surgical oncology and improving patient outcomes across Europe.

Graduating from the University of Vienna in the 1990s, the doctor began a residency at Vienna General Hospital, focusing on esophageal cancer biology. By the 2010s, the doctor was appointed Professor of Surgery and Head of the Upper GI Surgery Unit at the Medical University of Vienna, introducing advanced surgical programs.

Currently, the doctor serves as a consultant at Wiener Privatklinik, with active involvement in upper GI oncology and laparoscopic surgery. The doctor has numerous international publications and is a member of several oncology and surgical societies.

YOSAPHON VICHIENVANITCHKUL, M.D.

General Internal Medicine

Graduated (M.D. From)

Doctor of Medicine, Faculty of Medicine, Srinakharinwirot University

Working in general internal medicine treat patients with a wide range of acute and long-term medical conditions.

Certificates

Certificate of Internal Medicine, Faculty of Medicine, Bhumibol Adulyadej Hospital, Directorate of Medical Services, Royal Thai Air Force

Current Positions

General Internal Medicine doctor at Intrarat Hospital

The doctor is a respected physician based in Vienna, specializing in internal medicine and oncology. With a career marked by a patient-focused approach, the doctor combines advanced medical knowledge with compassion. After graduating from the Medical University of Vienna in the 1990s, the doctor pursued residency training in internal medicine and hematology/oncology, focusing on complex cancers and blood disorders.

In the 2000s, the doctor advanced in hematology and oncology, participating in clinical research and introducing new systemic therapies. Currently, as a consultant and attending physician at Wiener Privatklinik, the doctor treats solid tumors and hematologic malignancies, emphasizing systemic therapies and holistic care.

The doctor is a distinguished general and visceral surgeon with over 25 years of experience, specializing in bariatric and metabolic surgery, as well as complex gastrointestinal and abdominal procedures. He graduated from the University of Vienna and trained at the Medical University of Vienna, focusing on minimally invasive and laparoscopic techniques.

He serves as a senior consultant at Wiener Privatklinik, performing advanced procedures for obesity, reflux disease, hernias, and gastrointestinal cancers. His academic contributions include extensive research on metabolic regulation and bariatric surgery outcomes, and he has been a keynote speaker at international conferences.

The doctor is a distinguished Austrian medical oncologist and internist with over two decades of experience, specializing in breast cancer, gynecologic malignancies, and targeted cancer therapies. A graduate of the University of Vienna, the doctor completed residency in internal medicine and medical oncology at the Medical University of Vienna. The doctor has contributed to early clinical trials on targeted therapies and is a leading authority in individualized cancer treatment.

Currently serving as a senior consultant at Wiener Privatklinik and continuing academic work at the Medical University of Vienna, the doctor focuses on individualized systemic cancer therapy, immunotherapy, and translational cancer research. The doctor's research includes biomarker development and resistance mechanisms to targeted drugs, with publications in leading international journals.

The doctor is a highly respected Austrian general, visceral, and transplant surgeon specializing in hepato-pancreato-biliary surgery, liver transplantation, and oncologic abdominal surgery. With decades of experience, the doctor has significantly advanced complex abdominal procedures and interdisciplinary cancer treatment in Austria.

Graduating from the University of Vienna in the 1990s, the doctor completed specialist training in general and visceral surgery at the Medical University of Vienna. The doctor's work includes liver and pancreatic cancer surgeries, liver transplantation, and multivisceral resections.

The doctor is a senior consultant at Wiener Privatklinik and continues academic work at the Medical University of Vienna, with numerous publications on liver regeneration and surgical oncology outcomes.

The doctor specializes in managing pediatric inflammatory bowel diseases, celiac disease, and eosinophilic esophagitis, with expertise in performing endoscopic procedures in children.

Graduated from Tel Aviv University, Sackler Faculty of Medicine, and completed a Pediatrics Residency and Pediatric Gastroenterology Fellowship at Dana-Dwek Children's Hospital, Tel Aviv Sourasky Medical Center.

Active in academia as a lecturer and tutor, contributing to postgraduate and undergraduate medical education. A member of multiple professional societies, including the Israel Society for Pediatric Gastroenterology and Nutrition and the European Society of Pediatric Gastroenterology, Hepatology and Nutrition.

The doctor is a leading gastroenterologist in Israel with over 40 years of clinical experience. Specializing in the treatment of acute and chronic diseases of the esophagus, stomach, intestines, pancreas, and gastrointestinal cancer, the doctor is also an expert in hepatology, addressing biliary duct and liver abnormalities, as well as metabolic disorders. The doctor employs the latest medical treatments for viral hepatitis B and C.

Currently, the doctor serves as the chief gastroenterologist at Sourasky Medical Center and has also worked at Wolfson Medical Center. The doctor graduated from the Medical Faculty at Tel Aviv University and is a member of several prestigious medical associations.

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

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.

Gastroenterologist

Crohn's disease

Ulcerative colitis

Other autoimmune diseases

Gastritis

Ulcers of the stomach and duodenum

Precancerous conditions of the gastrointestinal tract

Irritable bowel syndrome

Chronic diarrhea

Chronic constipation, etc.

SPECIALIZATION:

Gastroenterologist

EDUCATION:

Azerbaijan State Medical University

COURSES:

Graduated from the Azerbaijan State Medical University. In different years, he participated in seminars held in Azerbaijan by German, Colombian, Swiss, Russian and Ukrainian specialists on "Basics of Homotoxicology", gastroenterology, isopathy, acupuncture and neurotherapy, and received the relevant certificates. At the Sisli Etfal Hospital Egitim Araştırma in Istanbul he attended the refresher courses on "Metabolic Disorders and Obesity", Ege University of Izmir on "Inflammatory Bowel Diseases" and at the same time he attended the Congress on Bioregulatory Drugs in Germany. He attended the courses held Individual Medical Association in Ankara, on the topic of "PRP-CGF and Serum Ozonation". Currently working as a gastroenterologist in the clinic of biological medicine. Has successful results in the treatment of a number of chronic diseases of the gastrointestinal tract.

EXPERIENCE:

21 years old

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.

The doctor has over 34 years of expertise in Medical Gastroenterology, with a focus on interventional sonography, endoscopic therapy of Zenker Diverticulum, and endoscopic resection of intestinal cancer. Additional areas of specialization include Endobarrier and therapy of inflammatory bowel disease.

Holding a fellowship with the European Board of Gastroenterology and memberships in several prestigious liver study associations, the doctor has contributed to numerous national and international publications.

Graduated in human medicine from Hamburg, Marburg, and Giessen, and furthered studies in health management, earning a Master of Science in 1999.

In 2007 he joined the Costa del Sol Hospital and left this position when he obtained an international scholarship that would take him back to San Francisco. In 2010 he moved to Japan to complete his training in the submucosal endoscopic dissection technique that he would later on introduce in Andalusia in 2011, thus becoming one of the pioneers in the performance of this technique in Spain. In 2011 he became the first medical professional in the world to use the 15-mm AXIOS stent in pancreatic fluid collection drainage. In 2018 he began to perform gastroenteroanastomosis with luminal apposition stent in patients with pancreatic cancer and bowel obstruction, thus becoming a pioneer in Andalusia to perform such technique.

He is a coauthor of the reference guides of the European Society of Gastrointestinal Endoscopy on the endoscopic treatment of chronic pancreatitis and non-variceal gastrointestinal haemorrhage.

Professional Experience

Over 24 years' experience

1999 - Degree in Medicine and Surgery. Malaga University, Spain.

2003 to 2006 - Medical Residency in the Digestive System at the Virgen Macarena Hospital in Seville, Spain.

2006 - International Scholar at the California Pacific Medical Center in San Francisco, USA.

2007 – Digestive System Specialist at the Costa del Sol Hospital, Marbella. Spain.

2008 - California Pacific Medical Center in San Francisco, USA.

2009 - Top Reviewer Award received from the Gastrointestinal Endoscopy Journal.

2011 – Pioneer in Spain in the introduction of the submucosal endoscopic dissection technique.

2011 – First professional in the world to use the AXIOS (15mm) stent for pancreatic fluid collection drainage.

2016 - Gold Medal of the Andalusian Society for Digestive Disease (SAPD, in its Spanish abbreviation).

2017 - Fellow of the American College of Gastroenterology (FACG).

2018 - Pioneer in Andalusia to perform gastroenteroanastomosis with luminal apposition stent to treat bowel obstruction.

2019 - Fellow of the American Society for Gastrointestinal Endoscopy (FASGE).

The Digestive System Unit of the Quirónsalud Marbella Hospital offers a patient service portfolio that includes all the clinical aspects of gastroenterology, hepatology, biliary duct and pancreatic disease, as well as the diagnostic and treatment techniques used in this speciality such as abdominal ultrasound, endoscopy and other functional tests.

Our specialists have solid professional backgrounds and the team is highly qualified for the diagnosis and treatment of complex diseases such as conditions related to acidity (gastric ulcers, helicobacter pylori, gastroesophageal reflux disease), enteropathies (Crohn's Disease, ulcerative colitis; coeliac disease...), viral hepatitis, hepatic cirrhosis, pancreatic disease...

The Digestive System Unit of the Quirónsalud Marbella Hospital is a pioneer in the implementation of a specific check-up programme for digestive disease with special attention to the diagnosis and treatment of colon precancerous lesions.

Diseases, treatments and techniques:

• Diagnostic and therapeutic endoscopic ultrasound

• Endoscopic resection techniques (mucosectomy/submucosal dissection)

• Submucosal or third-space endoscopy (POEM and variants)

• Bariatric endoscopy (Apollo Method)

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.

Education & Expertise

1995 to 2001 | Ege University Faculty of Medicine – Medical Education

2001 to 2006 | Dokuz Eylül University Faculty of Medicine – Internal Medicine Specialization

2008 to 2011 | Göztepe Training and Research Hospital – Gastroenterology Subspecialty

2014 | Ümraniye Training and Research Hospital – Associate Professor of Gastroenterology

2021 | University of Health Sciences – Professor

Professional Experience

2007 | Nusaybin State Hospital – Internal Medicine Specialist (Civil Service Obligation)

2011 to 2014 | Ümraniye Training and Research Hospital – Gastroenterology Specialist

2014 to 2017 | Ümraniye Training and Research Hospital – Associate Professor of Gastroenterology

2017 to 2021 | Health Sciences University – Associate Professor of Gastroenterology

2015 to 2021 | Ümraniye Training and Research Hospital Gastroenterology Clinic – Clinic Chief

2021 to 2022 | University of Health Sciences – Professor of Internal Medicine and Gastroenterology

2015 to 2022 | Genomic Laboratory (GLAB) Coordinator, Istanbul Provincial Health Directorate

2014 to 2021 | Northern Clinics of Istanbul Journal (indexed in WoS and PubMed) – Founding Editor

2021 to Present | Turkish Liver Research Association – Board Member

2022 to Present | Hepatology Bulletin Journal – Editor

2019 to Present | Hepatology Forum Magazine – Editor

2016 to Present | World Journal of Hepatology – Editor

International Experience

1999 | Trainee Doctor, Regional Infectious Diseases Unit, Western General Hospital, Edinburgh, UK

2000 | Trainee Doctor, Cardiology Unit, North Manchester General Hospital, Manchester, UK

2005 | Assistant Doctor, Regional Infectious Diseases Unit, Western General Hospital, Edinburgh, UK

Professional Memberships

Turkish Gastroenterology Association

Turkish Liver Research Association

EASL – European Association for the Study of Liver

APASL – Asian Pacific Association for the Study of Liver

AAAS – American Association for the Advancement of Science

Awards & Recognitions

2013 | Liver Fibrosis Pathways in Chronic Hepatitis B: A Comparative Proteomic Study – Gilead Fellowship Award

2014 | Liver Fibrosis Pathways in Chronic Hepatitis B: A Comparative Proteomic Study – Viral Hepatitis Fight Association Project Support Award

2014 | The Relationship between Spontaneous Seroconversion and Toll-Like Receptor Gene Polymorphism in Hepatitis B Infection – Turkish Gastroenterology Association, Best Poster Second Prize

2015 | Research on Damage Pathways in Liver Tissue in Chronic Hepatitis B: A Comparative Proteomic Study – Turkish Gastroenterology Association, Best Oral Presentation Third Prize

2016 | Investigations of the EGF and Its Receptor EGFR Gene Variants in Ulcerative Colitis – XV Euroasian Congress of Gastroenterology and Surgery, Best Oral Presentation Third Prize

Education and Specialization

• 2006: Kocaeli University Faculty of Medicine
• 2014: Akdeniz University Faculty of Medicine, Internal Medicine
• 2018: Akdeniz University Faculty of Medicine, Medical Oncology

Experience

• 2006 - 2008: Konya Derebucak District Hospital
• 2009 - 2015: Akdeniz University Hospital
• 2015: Antalya Kaş State Hospital
• 2015 - 2016: İnönü University Faculty of Medicine
• 2016 - 2021: Akdeniz University Hospital
• 2021 - 2023: Antalya Training and Research Hospital

Dr. Kallayanee Porngometkul is a gastroenterologist and Head of the Obesity Center at Yanhee International Hospital. She treats gastrointestinal and liver diseases. She has experience in endoscopic weight-loss therapy, including stomach balloon placement. She is also a speaker on obesity.

Education: MD, Srinakharinwirot University (2003). Internal Medicine training (2009). Subspecialty in Gastrointestinal Medicine (2014).

Credentials: Gastroenterological Association of Thailand; Gastrointestinal Endoscopy Association of Thailand; Liver Disease Association of Thailand; Medical Council of Thailand; Royal College of Physicians of Thailand.