Page 8 - Best gastroenterologists: TOP 198 doctors

Professor Rafael Bruck is the Chief Gastroenterologist at Sourasky Medical Center, with over 40 years of expertise in digestive and liver diseases.

• Specializes in treating complex conditions of the pancreas and liver
• Expert in advanced protocols for viral hepatitis B and C
• Member of the Israeli Association of Gastroenterology and Liver Diseases
• Treats a wide range of gastrointestinal cancers

Prof. Ozdil specializes in advanced gastroenterology procedures like EUS and ERCP at Biruni University Hospital, with multiple awards for his research in liver and inflammatory bowel diseases.

• 20+ years of experience in gastroenterology and internal medicine
• Expert in minimally invasive techniques including POEM and ESD
• Active member of Turkish Gastroenterology and Liver Associations
• Published significant research on Hepatitis C and ulcerative colitis

One of Ukraine's highest-category gastroenterologists – Dr. Shevchenko specializes in complex digestive disorders at ON Clinic Kharkiv Gagarina.

• 15+ years treating gastritis, colitis, and peptic ulcers
• Graduated from Kharkiv National Medical University
• Creates personalized treatment plans with thorough diagnostic analysis
• Trusted by patients with 67 positive reviews

Areas of Interests

• Inflammatory Bowel Disease (Ulcerative Colitis, Crohn's Disease)
• Chronic Liver Diseases and Cirrhosis
• Motility Disorders
• Gastroesophageal Reflux Disease
• Gall bladder and biliary tract diseases

Education and Experiences

• Istanbul University Cerrahpasa School of Medicine  1999-2005
• Okmeydani Education and Research Hospital 2005-2010
• Yeditepe University School of Medicine 2011-2015
• Liv Hospital Ulus 2018 -
• Haydarpaşa Education and Research Hospital, Department of Gastroenterology 2015-2018
• Yeditepe University School of Medicine, Department of Gastroenterology 2011-2015
• Erciş State Hospital 2010-2015
• Okmeydani Education and Research Hospital Department of Internal Medicine 2005-2010

Publications in International Refereed Journals:

1. Aslan E, Tecimer T. Periampullary nodularity in an asymptomatic patient. Gastroenterol Hepatol. 2023 Apr;46(4):307-308. English, Spanish. doi: 10.1016/j.gastrohep.2022.09.006. Epub 2022 Sep 26. PMID: 36174798.

2. Gonen C, Surmelioglu A, Kochan K, Ozer S, Aslan E, Tilki M. Impact of intestinal ultrasound with a portable system in the management of Crohn's disease. Gastroenterol Rep (Oxf). 2020 Dec 10;9(5):418-426. doi: 10.1093/gastro/goaa088. PMID: 34733527; PMCID: PMC8560037.

3. Güzelbulut F, Gökçen P, Can G, Adalı G, Değirmenci Saltürk AG, Aslan E, Özdil K, Doğanay HL. Comparison of the Efficacy of Entecavir and Tenofovir in Reducing Hepatocellular Carcinoma Risk in Chronic Hepatitis B Patients: A Real-Life Study in Turkey. Turk J Gastroenterol. 2021 Apr;32(4):412-421. doi: 10.5152/tjg.2021.20423. PMID: 34231488; PMCID: PMC8975336.

4. Abbasov A, Aslan E, Ekici AID, Dolay K. A rare subepithelial lesion in the stomach: Gastric adenomyoma. Surg Pract. 2021; 25: 116–119. https://doi.org/10.1111/1744-1633.12495

5. Aslan E. Black esophagus. Intern Emerg Med. 2021 Mar;16(2):503-504. doi: 10.1007/s11739-020-02463-4. Epub 2020 Aug 3. PMID: 32748126.

6. Batman B, Altun H, Simsek B, Aslan E, Namli Koc S. The Effect of Laparoscopic Sleeve Gastrectomy on Nonalcoholic Fatty Liver Disease. Surg Laparosc Endosc Percutan Tech. 2019 Dec;29(6):509-512. doi: 10.1097/SLE.0000000000000672. PMID: 31107849.

7. Aslan E, Gonen C. A rare cause of rectal bleeding. Acta Gastroenterol Belg. 2018 Apr-Jun;81(2):350. PMID: 30024717.

8. Eren OO, Ozturk MA, Sonmez O, Aslan E, Ozkan F, Oyan B. Gastric metastasis in a patient with lobular breast carcinoma 6 years after diagnosis. J Gastrointest Cancer. 2014 Dec;45(4):504-5. doi: 10.1007/s12029-014-9619-6. PMID: 24788083.

9. Aslan E, Akyüz Ü, Pata C. The use of Ankaferd in diverticular bleeding: two case reports. Turk J Gastroenterol. 2013;24(5):441-3. doi: 10.4318/tjg.2013.0640. PMID: 24557969.

10. Ozturk MA, Eren OO, Sarikaya B, Aslan E, Oyan B. Pituitary metastasis of colon adenocarcinoma: a rare occurrence. J Gastrointest Cancer. 2014 Dec;45 Suppl 1:85-7. doi: 10.1007/s12029-013-9554-y. PMID: 24158699.

11. Altintas N, Aslan E, Helvaci A, Malhotra A. Relationship between obstructive sleep apnea severity index and left ventricular function and volume. Ann Saudi Med. 2012 Jul-Aug;32(4):384-90. doi: 10.5144/0256-4947.2012.384. PMID: 22705609; PMCID: PMC3821963.
 

Publications in National Refereed Journals:

1. Ekrem Aslan, Ayça Saltürk, Koray Koçhan, Serhat Özer, Halil Şahin, Osman Bedir, Mevlüt Kıyak, Emine Kanatsız, Ali Sürmelioğlu, Can Gönen, Fatih Güzelbulut. Evaluation of the Efficacy and Safety of Self-Expanding Metal Stents in Malignant Esophageal Strictures Due to Esophageal and Extraesophageal Cancers: A Retrospective Cross-Sectional Cohort Study. Haydarpasa Numune Med J. 2024; 64(3): 381-390

2. Aslan, E., Gönen, C., Saltürk, A., & Güzelbulut, F. (2018). Hepatotoxicity After Desflurane Anesthesia. The Medical Journal Of Haydarpaşa Numune Training and Research Hospital, 58(4), 224-226.

3. SALTÜRK, A. D., ARSLAN, E., GÖKDEN, Y., KOÇHAN, K., ÖZER, S., & GÖNEN, C. (2016). A rare first finding of Crohn's disease: acute pancreatitis. academic journal of gastroenterology, 15(2), 88-89.

4. İçten, S., Altintas, N., Helvaci, A., & Aslan, E. (2013). Clinical Characteristics and Evaluation of Sarcoidosis Cases in Our Center, Our 7-Year Experience.

5. Akyüz, Ü., Akyüz, F., Özdil, K., Aslan, E., Niğdelioğlu, A., Ağan, A. F., ... & Pata, C. (2012). Food impaction in advanced age: Remember eosinophilic esophagitis. academic journal of gastroenterology, 11(2), 78-80.

6. PATA, C., ASLAN, E., & AKYÜZ, Ü. (2000). Advanced Endoscopic Procedures. Current Gastroenterology, 22, 77-85.

7. Altintas, N., Yildiran, I., Aslan, E., & Helvaci, A. Mucociliary Dysfunction in Bronchial Asthma and Effect of Inhaled Corticosteroids Treatment on Mucociliary Clearance.

8. Ozturk, M. A., Dogan Ekici, I., Aslan, E., Erdik, B., & Oyan Uluc, B. A PAINFUL, ERYTHEMATOUS, NODULAR LESION IN BUCCAL REGION. YEDITEPE MEDICAL JOURNAL, 6(23), 555-558.

Ranked among Germany's top gastroenterologists by Focus magazine, Dr. Claßen specializes in pediatric gastric conditions at Links der Weser Clinic.

• Head of Pediatric Gastroenterology, Hepatology and Nutrition with 40+ years of experience
• Expert in inflammatory bowel disease and functional disorders in children
• Trained at University Hospital Frankfurt for pediatric gastroenterology
• Member of European Society for Paediatric Gastroenterology

Surgeon, oncologist, specialist in the field of digestive system surgery and breast oncology.

25 years old

• Worked in clinics in the USA and Great Britain.
• Board Certified in Gastrointestinal Surgery by Johns Hopkins Institute, USA
• Certified as a specialist in laparoscopic surgery by the Port de Choisy Medical Center, France.
• Director of the American College of Surgeons for students from Turkey.

Prof. Erdem Koçak specializes in advanced endoscopic treatments for gastrointestinal conditions, trained at Johns Hopkins and Hallym University.

• Expert in endoscopic tumor treatments and obesity procedures
• Over 15 years of experience in gastroenterology
• Published more than 100 international articles
• Member of Turkish Society of Gastrointestinal Endoscopy

Pediatric and adolescent medicine, gastroenterology, hepatology, travel medicine

Ranked among Germany's TOP 100 gastroenterologists by Focus magazine – Prof. Porschen specializes in gastrointestinal tract tumors.

• Director of Internal Medicine at Bremen-Ost Clinic since 2000
• Develops German guidelines for esophageal cancer treatment
• Recipient of the Merit Award for metastatic colorectal carcinoma research
• Trained at MD Anderson Cancer Institute

Dr. Christian Molleken holds a patent in biomarkers for hepatic fibrosis – advancing precision diagnosis and treatment in gastroenterology at PRADUS Diagnostics.

• Senior Physician in Gastroenterology and Hepatology with multiple specializations
• Member of leading German societies in digestive diseases and oncology
• Expertise spans internal medicine, hematology, oncology, and infectiology
• Focus on developing innovative diagnostic approaches for liver conditions

Areas of Interests

• General Gastrointestinal Diseases
• Endoscopic procedures (gastroscopy, colonoscopy, enteroscopy, capsule endoscopy)
• Interventional endoscopy
• ERCP
• Endoscopic ultrasonography (EUS)
• Cholangioscopy
• Diseases of the biliary system and pancreas

Education:
 

• 1990 -1996 Ankara University Faculty of Medicine
• 1997 - 2001 Ankara Numune Training and Research Hospital Internal Medicine Residency
• 2001 - 2003 Turkey High Specialization Training and Research Hospital, Gastroenterology Subspecialization
• 2010 - 2010 State University of New York, USA, Department of Gastroenterology, EUS training program
   

Experience:
 

• June 2024 LIV Hospital Ulus Hospital
• 2018 - 2024 Florence Nightingale Hospitals, Gastroenterology Clinic
• 2013 - 2018 Memorial Ataşehir Hospital, Gastroenterology Clinic
• 2008 - 2013 Gaziantep University Faculty of Medicine, Department of Gastroenterology, Assoc. Prof. Dr.
• 2008 - 2008 Medicalpark Gaziantep Hospital Gastroenterology Clinic
• 2004 - 2008 Gaziantep State Hospital Gastroenterology Clinic, Endoscopy Unit Founding Physician

Publications

• Arhan M, Koklu S, Koksal AS, Yolcu OF, Koruk S, Koruk I, Kayacetin E. Alverine citrate induced acute hepatitis. World J Gastroenterol 2004; 10(15): 2303-4  ISSN: 1007-9327
• Parlak E, Cicek B, Koruk I, Disibeyaz S, Sahin B. Successful prevention of stent migration caused by placement of a second stent. Endoscopy. 2005; 37(4): 404. ISSN: 0013-726X
• Koruk I, Ozturk ZA, Köklü S, Koruk S, Ozdede S. Port-site metastasis after laparoscopic cholecystectomy. Acta Gastroenterol Belg. 2008; 71(2): 283-4      ISSN:0001-5644
• Koruk I, Parlak E, Secilmis S, Akdogan M, Koklu S.  Endoscopic sphincteroplasty with large balloon dilatation for extraction of difficult common bile duct stones. Dig Dis Sci. 2008 Jun;53(6):1737-8. ISSN: 0163-2116
• Ozkaya M, Yuzbasioglu MF, Koruk I, Cakal E, Sahin M, Cakal B. Preoperative detection of insulinomas: two case reports. Cases J. 2008 Nov 29; 1(1): 362  ISSN: 1757-1626
• Yılmaz Ö, Koruk İ, Çayır K, Koruk M, Yılmaz A. Usefullness of serum insulin-like growth factor (IGF-1) and insulin-like growth factor binding protein-3 (IGFBP-3) for colorectal cancer diagnosis. Int J Hematol Oncol 2009; 19(1): 23-27  ISSN: 1306-133X
• Savaş C, Koruk İ, Koruk M, Kadayıfçı A, Sarı İ. Association of prion protein with the stage of liver fibrosis in chronic viral hepatitis. Trakya Univ Tip Fak Derg. 2010; 27(4): 373-7. DOI: 10.5174/tutfd.2009.02284.1 ISSN: 1301-3149
• Buyukberber M, Koruk I, Cıkman O, Koruk M, Kucukoglu ME, Sakman A, Demir O, Sahinoz S. Serum cystatin C measurement in differential diagnosis of intra and extrahepatic cholestatic diseases. Ann Hepatol 2010; 9(1): 58-62  ISSN: 1665-2681
• Gulsen MT, Koruk I, Dogan M, Beyazit Y. Diagnostic accuracy of cascade stomach by upper gastrointestinal endoscopy in patients with obscure symptoms: A multi-center prospective trial. Clin Res Hepatol Gastroenterol. 2011; 35: 489-93. DOI: 10.1016/j.clinre.2011.03.004         ISSN: 2210-7401
• Koruk I, Aydın U, Koruk S, Aydınlı M. A newly defined biliary anatomic variation. Turk J Gastroenterol 2011; April 22(2): 232-3  DOI:10.4318/ tjg.2011.0204  ISSN: 1300-4948
• Koruk İ, Özdemir H, Aydınlı M, Tarakçıoğlu M, Koruk M. The relation between serum Cytokeratin 18 and acute pancreatitis: Can it be a serological predictive marker?. Turk J Gastroenterol. 2011. DOI:10.4318/tjg.2011.0256 ISSN: 1300-4948
• Aydinli M, Koruk I, Koruk S, Aydin U, Kadayifci A. Intraoperative cholangioscopy with an ultrathin endoscope for hemobilia. Endoscopy 2011;43 Suppl 2 UCTN:E410. doi: 10.1055/s-0030-1256897. Epub 2012 Jan 24
• Aydinli M, Koruk I, Dag MS, Savas MC, Kadayifci A. Ultrathin endoscopy for gastrointestinal strictures. Digestive Endoscopy 2012 May;24(3):150-3. doi: 10.1111/j.1443-1661.2011.01206.x. Epub 2011 Oct 27                 ISSN: 0915-5635
• Yılmaz Ö, Koruk İ, Onbaş O, Ozgokce M. Portal venous gas resulting from enteritis in a case with portal hypertension: Case report. Türkiye Klinikleri Tıp Bilimleri Dergisi. 2012; 32 (4): 1195-8 ISSN: 1300-0292
• Demiryürek S, Koruk I, Bozdag Z, Ozkara E, Kaplan DS, Oztuzcu S, Cetinkaya A, Alasehirli B, Demiryürek AT. Investigation of the esophageal Rho-kinase expression in patients with Barrett's esophagus. Ultrastruct Pathol. 2013 Aug;37(4):284-9. doi: 10.3109/01913123.2013.797064        ISSN: 0191-3123
• Dag MS, Ozturk ZA, Koruk I, Kısacık B, Gerenli O, Aydınlı M, Kadayıfcı A. Intestinal Behcet's disease with severe pulmonary arterial involvement mimicking ulcerative colitis. Asian Biomedicine. 2013; 7(5): 715-8      ISSN: 1905-7415
• Dağ MS, Aydınlı M, Oztürk ZA, Türkbeyler IH, Koruk I, Savaş MC, Koruk M, Kadayıfçı A. Drug- and herb-induced liver injury: a case series from a single center. Turk J Gastroenterol. 2014 Feb;25(1):41-5. doi: 10.5152/tjg.2014.4486ISSN: 1300-4948
• Kadayifci A, Atar M, Parlar S, Balkan A, Koruk I, Koruk M. Transnasal endoscopy is preferred by transoral endoscopy experienced patients. J Gastrointestin Liver Dis. 2014 Mar;23(1):27-31     ISSN: 1841-8724
• Alasehirli B, Oğuz E, Oksuzler E, Koruk I, Oztuzcu S, Ozkara E, Karakok M, Erbagcı AB, Demiryurek AT. Investigation of intercellular adhesion molecules (ICAMs) gene expressions in patients with Barrett's esophagus. Tumour Biol. 2014 May;35(5):4907-12. doi: 10.1007/s13277-014-1644-3      ISSN: 1010-4283
• Dag M, Özturk Z, Aydınlı M, Koruk I, Kadayfçı A. Postpartum hepatotoxicity due to herbal medicine Teucrium polium. Ann Saudi Med. 2014 Nov-Dec;34(6):541-3. doi: 10.5144/0256-4947.2014.541        ISSN: 0256-4947
• Tahtacı M, İbiş M, Koruk İ, Parlak E. Endoscopic removal of fractured basket traction wire. Turk J Gastroenterol. 2014 Dec;25 Suppl 1:324-5. doi: 10.5152/tjg.2014.6582            ISSN: 1300-4948
• Dağ MS, Koruk İ, Aydınlı M, Çam H, Öztürk ZA, Kadayıfçı A. An unusual cause of esophageal ulcer; sertraline hydrochloride. Turk J Gastroenterol. 2014 Dec;25 Suppl 1:250-1. doi: 10.5152/tjg.2014.4646  ISSN: 1300-4948
• Balkan A, Yılmaz N, Balkan Y, Koruk İ, Örkmez M, Aydınlı M, Koruk M. Relationship between liver injury and serum cytokeratin 18 levels in asymptomatic hepatitis B virus carriers and in patients with chronic hepatitis B infection. Arab Journal of Gastroenterology. 2017; 18: 98–103                   ISSN: 1687-1979
• Koruk İ. How to manage difficult cannulation in ERCP. Gastroenterology and Hepatology: Open Access. 2017, 6(3): 00194. DOI: 10.15406/ghoa.2017.06.00194 ISSN: 2373-6372
• Valori R, Cortas G, de Lange T, Balfaqih OS, de Pater M, Eisendrath P, Falt P, Koruk I, et al.  Performance measures for endoscopy services: A European Society of Gastrointestinal Endoscopy (ESGE) Quality Improvement Initiative.  Endoscopy 2018; 50: 1186–1204   ISSN 0013-726X
• Koruk S, Koruk I, Mizrak A. A, Bilgi M, Gul R, Bozgeyik S. Dexmedetomidine or midazolam in combination with propofol for sedation in endoscopic retrograde cholangiopancreatography: a randomized double blind prospective study. Videosurgery Miniinv. 2020; 15(3): 526-32 doi.org/10.5114/wiitm.2020.95066

Dr. Karli specializes in pediatric gastroenterology, focusing on newborns and children, with extensive training and research in childhood nutrition and diseases.

• Expert in breastfeeding and nutrition consultancy for infants
• Specialized in newborn care and follow-up procedures
• Trained at top institutions including Istanbul University and Şişli Hamidiye Etfal
• Presented research on pediatric conditions like acute pancreatitis

Director of Obesity Therapy Department

Specialist in endocrinology and nutrition

Dr. Yogesh Batra is a distinguished Gastroenterologist and Hepatologist, recognized with the Young Investigator Award and Best Paper Award for his contributions to liver and digestive health.

• Over 20 years of specialized experience in gastroenterology
• Trained at AIIMS, New Delhi – one of India's top medical institutes
• Member of the Indian Society of Gastroenterology and Society of Gastrointestinal Endoscopy of India
• Authored 30+ national and international publications
• Frequently invited as faculty at major medical conferences