Beste Ärzte weltweit: 4354 geprüfte Spezialisten

Dr. Oya Ercan is a pediatric endocrinologist at Memorial Şişli Hospital in Istanbul. She founded the Adolescent Science Branch at Cerrahpaşa Medical Faculty. Dr. Ercan specializes in hormonal disorders in children and teenagers. She previously served as visiting Chief Resident at Middlesex Hospital in London.

• Current Head of the Department of Pediatric Endocrinology at Cerrahpaşa Medical Faculty.
• Treats a wide variety of pediatric endocrine and cellular conditions.
• Practices at JCI-accredited Memorial Şişli Hospital, a leading center for specialized care.
• Holds nearly four decades of clinical experience in Turkish and British medical systems.

The doctor is an Associate Professor with extensive clinical training and academic experience. Medical education was completed at Gazi University Faculty of Medicine, followed by specialized training as an Assistant Physician at Şişli Hamidiye Etfal Education and Research Hospital. Further expertise was gained through minor specialization training at the T.R. Istanbul Science University European Florence Nightingale Hospital.

With a career spanning over two decades, the doctor has demonstrated a commitment to medical excellence and academic advancement in the field, currently serving in a senior clinical and educational capacity in Istanbul.

Dr. Engin Tutar is a pediatric gastroenterologist at Hisar Hospital Intercontinental in Istanbul. He is the former head of Pediatric Gastroenterology at Marmara University. Dr. Tutar has delivered over 50 presentations at national and international medical congresses. He specializes in treating complex digestive, liver, and nutritional disorders in children.

• Performs diagnostic and therapeutic endoscopy, including polypectomy and esophageal variceal bleeding control.
• Treats inflammatory bowel disease, Celiac disease, and H. pylori infections.
• Manages chronic pediatric conditions such as growth disorders and liver diseases.
• Works at JCI-accredited Hisar Hospital, which treats over 500,000 patients annually.

Dr. Nesrin Sariman is a pulmonology and sleep medicine specialist at Hisar Hospital Intercontinental. She treats asthma, COPD, and lung cancer. Dr. Sariman is a bronchoscopy specialist. She participated in a multicenter international clinical study on asthma. Dr. Sariman holds certifications in functional medicine and phytotherapy from Medipol University.

• Served as Assistant Dean at Maltepe University from 2019 to 2022.
• Treats sleep disorders including obstructive sleep apnea syndrome.
• Maintains memberships in several national and international medical associations.
• Works at Hisar Hospital Intercontinental, a JCI-accredited facility in Istanbul.

Dr. Elif Evrim Ekin is a radiologist at the JCI-accredited Hisar Hospital Intercontinental in Istanbul. She specializes in musculoskeletal radiology and breast imaging. Dr. Ekin serves as the Education Coordinator at the Radiology Education Clinic. She has published extensive research in international journals indexed in SCI and SCI-E.

• Obtained her Medical Doctor title from Ege University Faculty of Medicine.
• Completed specialized radiology training at Izmir Bozyaka Training and Research Hospital.
• Maintains a focus on musculoskeletal diagnostics and breast health imaging.
• Completed the Fundamentals of Good Clinical Practice training.
• Works at a facility that treats over 500,000 patients annually.

Dr. Suveyda Gozukucuk is an infectious disease specialist at Hisar Hospital Intercontinental in Istanbul. She focuses on hospital-acquired infections and sterilization protocols. Dr. Gozukucuk also treats viral hepatitis and hepatitis C cases. She practices at a JCI-accredited facility recognized for high safety standards.

• Specializes in infection management for immunocompromised patients.
• Expertise in hospital sterilization and disinfection procedures.
• Completed medical specialization at Erciyes University Faculty of Medicine.
• Treats patients at a hospital serving over 500,000 people annually.

Dr. Gulsah Ozturk Ozluk is a neurosurgeon at Memorial Şişli Hospital in Istanbul. She completed her specialized medical training at Johns Hopkins University in the United States. Dr. Ozluk later gained clinical experience at Oregon Health and Science University. She treats patients at a JCI-accredited facility known for its high organ transplant success rates.

• Completed neurosurgery specialization training at the prestigious Johns Hopkins University.
• Obtained clinical training at Oregon Health and Science University.
• Works at Memorial Şişli Hospital, the first hospital in Turkey to earn JCI accreditation.
• Previously served as a neurosurgery specialist at Acibadem Health Group.

Dr. Mehmet Yasar Kaynar is a neurosurgeon at Memorial Şişli Hospital in Istanbul. He holds extensive leadership experience in Turkish neurosurgery. Dr. Kaynar previously directed the Istanbul University Institute of Neurological Sciences. He treats patients at a JCI-accredited facility known for its high success rates.

• Former Head of Neurosurgery at Cerrahpasa Medical Faculty, Istanbul University.
• Served as a Board Member of the Turkish Neurosurgery Association.
• Former Head of the Neurovascular Group of the Turkish Neurosurgery Association.
• Served on the qualification board for the Turkish Neurosurgery Association.

Dr. Naci Karaagac is a neurology specialist at Memorial Şişli Hospital in Istanbul. He has maintained a clinical presence at Cerrahpaşa Medical Faculty since 1982. Dr. Karaagac treats patients at one of Turkey’s most established private medical centers. He works within a JCI-accredited facility that holds world-class safety standards.

• Practices at Memorial Şişli Hospital, the first JCI-accredited center in Turkey.
• Served as a neurology specialist at the American Hospital and German Hospital.
• Completed medical service as a specialist at Maslak Military Hospital.
• Treats a variety of neurological conditions within a multidisciplinary hospital setting.

Dr. Abdullah Yakupoglu is an interventional radiologist at Memorial Şişli Hospital in Istanbul. He specializes in interventional oncology. Dr. Yakupoglu has held several leadership roles at major Turkish medical centers. He works at a JCI-accredited facility known for its high success rates in complex procedures.

• Served as the Interventional Radiology Manager at Acıbadem Health Group.
• Former Interventional Radiology Manager at both American Hospital and German Hospital.
• Focuses on minimally invasive techniques for treating oncological conditions.
• Practices at the first Turkish hospital to earn Joint Commission International accreditation.

Dr. Yasar Colak is a Professor of Gastroenterology at Memorial Şişli Hospital in Istanbul. He has deep expertise in liver transplantation and therapeutic endoscopy. Dr. Colak served as an invited lecturer at the Cleveland Clinic Florida. He also worked in the Presidential Health Coordinatorate in Turkey.

• Specializes in liver transplantation and digestive tract disorders.
• Completed clinical training at the Cleveland Clinic Department of Endoscopic Applications.
• Treats patients at Memorial Şişli, the first JCI-accredited hospital in Turkey.
• Formerly served as an Associate Professor at Istanbul Civilization University.

Dr. Servet Izci is a cardiologist with 24 years of clinical practice. He earned his MD at Fırat University (1996–2002). He completed a cardiology residency at Kartal Koşuyolu Training and Research Hospital (2010–2015). He worked as a consultant cardiologist at Kartal Koşuyolu (2015–2025) and Pendik Medical Park (2025–2026). He now practices at Lokman Hekim Istanbul Hospital (2026–present). He is a member of the Istanbul Medical Chamber and the Turkish Society of Cardiology.

Clinical focus: coronary angiography and stenting via radial access. He also performs peripheral and carotid artery interventions. He manages arrhythmias, hypertension, hyperlipidemia, and heart failure. Scientific output: three publications. Topics include catestatin as a predictor of mortality in acute pulmonary embolism, ECG changes during alcohol withdrawal, and the increased risk of high‑grade AV block in non‑O blood types.

The doctor is a graduate of one of the premier dental schools in Istanbul. With a dedicated focus on restorative and aesthetic dentistry, the doctor is committed to providing high-quality dental care and improving patient smiles through professional clinical practice.

Dr. Deniz Gören is a hematologist at Memorial Şişli Hospital in Istanbul. She specializes in treating blood cancers and complex bone marrow disorders. Dr. Gören represents the European Society for Blood and Marrow Transplantation. She completed selective medical training at Harvard University Faculty of Medicine.

• Treats leukemia, lymphoma, myeloma, and aplastic anemia.
• Completed a specialist masterclass in lymphoma at the Turkish Academy of Blood Science.
• Practices at JCI-accredited Memorial Şişli, which reports a 90% organ transplant success rate.
• Member of the Turkish Academy of Blood Science and the EBMT.

Dr. Fatma Kural Aydin is an internal medicine specialist at Hisar Hospital Intercontinental in Istanbul. She focuses on endocrine and metabolic diseases. Dr. Aydin graduated from the Istanbul University Cerrahpaşa School of Medicine. She later finished her residency at the Istanbul School of Medicine.

• Expert in managing complex internal medical conditions and metabolic disorders.
• Provides differential diagnosis and monitoring for varied internal diseases.
• Practices at a JCI-accredited hospital that serves over 500,000 patients annually.
• Performs diverse diagnostic screenings, including heart, cancer, and endocrine check-ups.

Dr. Naci Erciyes Yagan is a surgeon at Memorial Şişli Hospital in Istanbul. He specializes in chest and cardiovascular surgery. He has worked at several major Turkish medical centers since 1990. Dr. Yagan currently treats patients at one of Turkey's first JCI-accredited hospitals.

• Serves as a cardiovascular surgeon at Memorial Şişli Hospital.
• Held senior surgical roles at Florence Nightingale Hospital.
• Practiced at Yedikule Pulmonary Diseases Hospital.
• Works at a facility with a 90% success rate for organ transplants.

Place and Date of Birth 
Ankara, 1980 

Foreign Languages 
English 

Education and Experience 
1998 – 2004 Gülhane Military Medical Academy, Faculty of Medicine 
2005 – 2007 6th Motorized Infantry Brigade Infirmary, Şırnak (General Practitioner) 2007 – 2011 Gülhane Military Medical Academy, Department of Ophthalmology (Specialization) 
2011 – 2018 Isparta Military Hospital / Isparta Yunus Emre State Hospital (Specialist Physician) 
2018 – 2022 Süleyman Demirel University, Department of Ophthalmology (Assistant Professor) 
2019 – 2019 Gülhane Military Medical Academy, Department of Ophthalmology Vitreoretinal Surgery Course 
2022 – 2024 Lara Anatolia Hospital (Associate Professor) 

Number of Scientific Publications 
Over 50 scientific publications 
 

Clinical Experience 
13 years of active practice in ophthalmology; experience with over 10,000 cases 

Procedures Performed

• Cataract surgery with IOL replacement (Single and both eyes)
• LASIK and IntraLase laser eye surgery
• ReLEx SMILE and Photorefractive keratectomy (PRK)
• Corneal Cross Linking (CCL) for keratoconus
• Strabismus treatment and surgical correction
• Artisan Iris and Claw Lens applications
  Oculoplasty (eyelid surgery)
  
  Professional Memberships 
  Turkish Ophthalmological Association (TOD)
  American Academy of Ophthalmology (AAO) 
  
  Certifications 
  International Council of Ophthalmology (ICO) – Optics, Refraction & Instruments (2019)
   International Council of Ophthalmology (ICO) – Basic Sciences (2019) International Council of Ophthalmology (ICO) – Clinical Examination (2020) International Council of Ophthalmology (ICO) – Fellowship of the International Council of Ophthalmology (FICO) (2021) 
  European Board of Ophthalmology – Fellowship of the European Board of Ophthalmology (FEBO) (2021) 
  Awards 3rd Place for Best Research, 43rd National Congress of the Turkish Ophthalmological Association (TOD), 2009 
   

Books/Book Chapters 
Umut Karaca, *Healthy Generation, Secure Future: A Guide to Growth, Development, and Nutrition for School-Aged Children (for Families and Teachers)* – Chapter: "Vision Problems" (2021) 
Umut Karaca, *COVID-19 Pandemic: Current Approaches* – Chapter: "The Impact of the COVID-19 Pandemic on Clinical Ophthalmology Practice" (2021) 
Umut Karaca, *Physical Examination Handbook (Süleyman Demirel University Faculty of Medicine)* – Chapter: "Strabismus Examination" (2019)
Umut Karaca, Murat Küçükevcilioğlu, Ali Hakan Durukan – *Pediatric Vitreoretinal Surgery* – Chapter title:(Closed Globe Injuries) (2023)

Dr. Levent Kilickan is an anesthesiologist at Hisar Hospital Intercontinental in Istanbul. He achieved full professorship at Kocaeli University Faculty of Medicine. Dr. Kilickan focuses on cardiovascular anesthesia and organ transplantation. He works at a JCI-accredited facility meeting international safety standards.

• Specializes in intensive care and regional anesthesia.
• Completed medical residency at Istanbul Taksim Hospital.
• Treats patients at a clinic serving over 500,000 people annually.
• Experienced in complex anesthesia for major cardiovascular surgeries.