Page 25 - Les Meilleurs Médecins au Monde

Dr. Gokhan Ertas is a Professor of Cardiology with more than 20 years of clinical and academic experience. He has published 52 articles in international peer-reviewed journals. He has also contributed 3 chapters to national and international books. Dr. Ertas has presented 20 papers at international meetings and 25 at national meetings. He is dedicated to advancing cardiovascular medicine.

He is a member of the Turkish Society of Cardiology, the European Society of Cardiology, and the Stem Cell and Cellular Therapies Association. Dr. Ertas is recognized for his academic work and active role in the global cardiology community.

Medical Experience

- *2024 - Present*: Memorial Şişli Hospital  

 Ophthalmology Specialist / Istanbul

- *2022 - 2024*: Liv Hospital Ulus  

 Ophthalmology Specialist / Istanbul

- *2021 - 2022*: Private Clinic  

 Ophthalmology Specialist / Istanbul

- *2019 - 2021*: Şişli Hamidiye Etfal Training and Research Hospital  

 Ophthalmology Specialist / Istanbul

- *2017 - 2019*: Gaziosmanpaşa Taksim Training and Research Hospital  

 Ophthalmology Specialist / Istanbul

- *2015 - 2017*: Tirebolu State Hospital  

 Ophthalmology Specialist / Giresun

 Medical Education

- *2011 - 2015*: Cumhuriyet University Hospital  

 / Sivas / Turkey

- *2000 - 2007*: Gazi University Faculty of Medicine  

 / Ankara / Turkey

Medical Experience

- *2024 - Present*: Memorial Şişli Hospital  

 Ophthalmology Specialist / Istanbul

- *2022 - Present*: Private Clinic  

 Ophthalmology Specialist / Istanbul

- *2019 - 2022*: Liv Hospital Ulus  

 Ophthalmology Specialist / Istanbul

Medical Education

- *2014 - 2018*: Selcuk University Faculty of Medicine  

 / Konya / Turkey

- *2004 - 2010*: Azerbaijan Medical University Faculty of Medicine  

 / Baku / Azerbaijan

Dr. Tugce Bigis is a skilled dentist. She graduated as valedictorian from Suphi Koyuncuoğlu Anatolian High School. She then completed her dental degree at Ege University Faculty of Dentistry, ranking second in her class. She has shown strong academic performance throughout her studies.

Dr. Bigis continues to improve her skills by attending professional courses, trainings, and congresses. She stays updated on the latest developments in dentistry. Her dedication to learning helps her provide high-quality dental care to her patients.

Prof. Mustafa Sağlam, M.D. graduated from Marmara University School of Medicine in 1994 and has specialized in Endovascular Repair of the Aneurysm of Abdominal Aorta, Stress Test for imaging the Coronary Artery Diseases, Ambulatory Cardiac Monitoring, Holter Test, Balloon Valvuloplasty and Temporary Pacemaker. He is currently the Head of the Cardiology Department in Hisar Hospital Intercontinental.

Dr. Görkem Özgen is a general surgeon with many years of clinical experience. He has a strong academic background. He graduated from the Hacettepe University Faculty of Medicine (English Program). He completed his specialization in General Surgery at the Istanbul University Faculty of Medicine.

He has worked in public and private healthcare institutions. He brings this experience to his private practice. His clinical focus includes obesity treatment, breast diseases, abdominal wall hernias, and anorectal disorders. He uses current, safe, and science-based surgical methods within a multidisciplinary care model.

EXPERIENCE

2018 - Present, Istanbul, Turkey

MEMORIAL ATAŞEHİR HOSPITAL

Gastroenterology Specialist

2017 - 2018, Istanbul, Turkey

ULUS LIV HOSPITAL

Gastroenterology Specialist

2013 - 2016, Istanbul, Turkey

MEDICAL PARK BAHÇELİEVLER HOSPITAL

Gastroenterology Specialist

2011 - 2013, Nevşehir, Turkey

NEVŞEHİR STATE HOSPITAL

Mandatory Service

EDUCATION

2008 - 2011, Izmir, Turkey

DOKUZ EYLÜL UNIVERSITY

Gastroenterology Residency Training

2002 - 2007, Istanbul, Turkey

ISTANBUL FACULTY OF MEDICINE

Internal Medicine Residency Training

1994 - 2001, Istanbul, Turkey

MARMARA UNIVERSITY FACULTY OF MEDICINE

Medical Degree

SCIENTIFIC PUBLICATIONS

Numerous national and international articles and publications

PROFESSIONAL MEMBERSHIPS

• Turkish Gastroenterology Association

• Turkish Endoscopy Association

• Turkish Liver Research Association

• Internal Medicine Association

PARTICIPATION IN PROFESSIONAL TRAININGS, COURSES, AND CONFERENCES

Extensive participation in various professional training programs, courses, and congresses

Dr. Nurettin Demirkol is a physician with expertise in hypertension, hyperlipidemia, thyroid diseases, diabetes, and vascular conditions. He also manages the follow-up of chronic diseases. Dr. Demirkol has strong experience in identifying causes and making diagnoses. He provides advanced care in internal medicine.

He completed his undergraduate and specialization training at Istanbul University, Istanbul Faculty of Medicine. He also earned a master’s degree in Health Management from Okan University. Dr. Demirkol has worked at Hisar Intercontinental Hospital, Kozyatağı Central Hospital, and Istanbul Faculty of Medicine. He has made important contributions to patient care and chronic disease management at these institutions.

2001 - Present, Istanbul/Istanbul/Türkiye

MEMORIAL SISLI HOSPITAL

Head of Cardiovascular Surgery Department

1990 - 2001, Istanbul/Istanbul/Türkiye

FLORENCE NIGHTINGALE HOSPITAL

Head of Surgical Sciences

1990 - 1995, Istanbul/Istanbul/Türkiye

ISTANBUL UNIVERSITY INSTITUTE OF CARDIOLOGY

Cardiovascular and Surgery Specialist

1987 - 1990, London/London/England

ST. THOMAS HOSPITAL

Chief Resident of Cardiovascular Surgery

1986 - 1987, Istanbul/Istanbul/Türkiye

ISTANBUL UNIVERSITY FACULTY OF MEDICINE

Chief Assistant of Cardiovascular Surgery

1985 - 1986, Ankara/Ankara/Türkiye

GÜLHANE MILITARY MEDICAL ACADEMY

Dr. Onur Telli is a skilled urologist and pediatric urology specialist. He is known for his work in diagnosing and treating congenital urogenital anomalies. He has received awards from the European Association of Urology and the European Society for Pediatric Urology. These honors reflect his strong clinical and research skills.

Dr. Telli has published over 50 international articles and contributed to three book chapters in pediatric urology. His research includes important population-based studies, especially on nocturia in women of reproductive age. He is an active member of major urological associations. This shows his dedication to improving the field.

2020 - Present, Istanbul/Türkiye

MEMORIAL SISLI HOSPITAL

Orthopedics and Traumatology Specialist

2013 - 2020, Istanbul/Türkiye

NISA HOSPITAL

Orthopedics and Traumatology Specialist

2009 - 2013, Istanbul/Türkiye

MEDILIFE HOSPITAL

Orthopedics and Traumatology Specialist

2008 - 2009, Diyarbakir/Türkiye

DIYARBAKIR MILITARY HOSPITAL

Orthopedics and Traumatology Specialist

2004 - 2008, Istanbul/Türkiye

GÜLHANE MILITARY MEDICAL ACADEMY

Orthopedics and Traumatology Specialist Training

2003 - 2004, Kocaeli/Türkiye

TCG GÖKSU NAVAL FORCES COMMAND

Medical Officer, General Practitioner

2002 - 2003, Muğla/Türkiye

TCG MUTUAL NAVAL FORCES COMMAND

Medical Officer, General Practitioner

2001 - 2002, Ankara/Türkiye

ANKARA TRAINING AND RESEARCH HOSPITAL

Medical Officer, General Practitioner

Dr. Mehmet Aydogan is a specialist in Orthopedics, Traumatology, and Spine Surgery at Memorial Şişli Hospital. He worked in Spine Surgery there in 2024–2025 and has been in Orthopedics since 2026. He previously led the Orthopedic Surgery, Traumatology & Advanced Spine Surgery Center at Emsey Hospital (2018–2022). His experience includes the EURO SPINE Surgical Spine Center of Excellence in Switzerland (2022–2024) and a research fellowship at the UCLA Comprehensive Spine Center (2009–2011). He also held posts at Boğaziçi Spine Center, Medical Park Göztepe, and Florence Nightingale.

Education: MD, Ege University (1990–1996). Residency in Orthopedics and Traumatology at Dr. Lütfi Kırdar Kartal TRH (2000–2004). Publications: 50 journal articles and 37 presentations.

Memberships: TTB, TOTBİD, Turkish Spine Society, MINOD, NASS, SRS, European Spine Society, and APSS.

Dr. Cagatay Saim Tezel is a Professor of Thoracic Surgery at Memorial Şişli Hospital since 2025. From 2021 to 2025, he was a Professor at Haliç University Faculty of Medicine and at Liv Hospital Ulus. Earlier, he served at SB Süreyyapaşa Chest Diseases and Thoracic Surgery Training and Research Hospital as a specialist, associate professor, and educational supervisor.

He earned his MD from Ankara University. He completed his Thoracic Surgery specialization at SB Heybeliada Chest Diseases and Thoracic Surgery Hospital from 2000 to 2005. His international training includes a 6‑month observership at the Royal Brompton Hospital and work in the Leicester University clinics. He also attended the STS 41st Annual Meeting and the Ankara University Esophageal Surgery Program. He was part of the Süreyyapaşa Thoracic Surgery Transplant Team. He was an internship lecturer at Yeditepe University from 2013 to 2020. He served on the editorial board of the Heybeliada Medical Bulletin in 2001.

He is a member of the Turkish Thoracic Surgery Society, the European Society of Thoracic Surgeons, the Turkish Thoracic Society, and the European Respiratory Society. He advised a thesis that won third place in the Istanbul Medical Chamber Thesis Competition.

Prof. Dr. Ayla Güven graduated from Gazi University Faculty of Medicine in 1986 and completed her mandatory service at Ege University Chest Diseases Bornova Tuberculosis Dispensary. Following that, she started her specialization training in the Department of Child Health and Diseases at Hacettepe University Faculty of Medicine and became a specialist in 1993. After working as a specialist physician, she began her subspecialty training in Pediatric Endocrinology at Gazi University Faculty of Medicine in September 2000 and became a Pediatric Endocrinology specialist in December 2002. In April 2003, she started working as an assistant professor at Ondokuz Mayıs University Faculty of Medicine and worked in the Pediatric Endocrinology and Diabetes Department at the Children’s Hospital of Pittsburgh, USA, between May and November 2003. After returning to Turkey, she continued to work at Ondokuz Mayıs University Faculty of Medicine. This clinic was the first to offer Pediatric Endocrinology subspecialty training in the country. During her time there, one person became a Pediatric Endocrinology specialist. On March 13, 2006, she successfully passed the exam and received the title of Associate Professor. Since December 2006, she has been working at Göztepe Training and Research Hospital. In this hospital, she was appointed as the head of the Pediatric Endocrinology clinic in November 2008 and started providing Pediatric Endocrinology subspecialty training for the first time in the hospital in March 2009. Between 2009 and 2017, she trained five Pediatric Endocrinology specialists. Most of the physicians she currently provides subspecialty training to have gained academic titles as professors and associate professors. After working as a training instructor at Health Sciences University Zeynep Kamil Hospital for Children and Women from 2017 to 2021, she retired at her request from public service. Between 2021 and 2024, she worked as a Pediatric Endocrinology specialist at Başkent University Faculty of Medicine, Department of Child Health and Diseases, at Istanbul Hospital.

MEDICAL INTERESTS

• Menstrual disorders and increased hair growth in girls, polycystic ovary syndrome
• Adrenal diseases
• Sexual development disorders
• Type 2 diabetes
• Thyroid diseases
• Growth disorders: short stature and tall stature
• Puberty disorders: precocious puberty-delayed puberty

Dr. Ismail Onder Uysal is a specialist in plastic surgery and ENT with over 26 years of experience. He has performed around 2,500 procedures. He is known worldwide for his skills in rhinoplasty, including open and closed techniques and revision surgeries.

Dr. Uysal graduated from Cumhuriyet University in 1999. He has worked as a lecturer in academic medicine and has published in international medical journals. Many patients from different countries seek his advanced surgical care.

Dr. Alihan Gurkan is a gastrointestinal surgeon with over 25 years of experience. He specializes in bariatric and advanced gastrointestinal procedures. For more than ten years, he led the Department of General Surgery. He is known for his focus on patient safety and his commitment to international standards.

Dr. Gurkan is a member of several professional organizations, such as the American Society of Transplant Surgeons and the Turkish Society of Surgery. He completed advanced fellowships in cardiovascular and multi-organ transplantation at leading US institutions. His practice is known for high success rates and the use of modern surgical techniques.

2020 - Present, Istanbul/Istanbul/Türkiye

MEMORIAL ATASEHIR HOSPITAL

Thoracic Surgery Specialist

2018 - 2020, Tekirdağ/Tekirdağ/Türkiye

CORLU STATE HOSPITAL

Thoracic Surgery Specialist

2012 - 2018, Istanbul/Istanbul/Türkiye

MARMARA UNIVERSITY FACULTY OF MEDICINE

Research Assistant

2011 - 2012, Bilecik/Bilecik/Türkiye

BILECIK GOLPAZARI STATE HOSPITAL

Chief Physician

2010 - 2012, Bilecik/Bilecik/Türkiye

BILECIK GOLPAZARI STATE HOSPITAL

General Practitioner

2023 - Present, Istanbul/Türkiye

MEMORIAL SISLI HOSPITAL

Organ Transplantation, General Surgery

2023 - 2023, Istanbul/Türkiye

YEDİTEPE UNIVERSITY ORGAN TRANSPLANTATION-GENERAL SURGERY

Organ Transplantation Center Responsible Physician

2019 - 2022, Duzce/Türkiye

DUZCE UNIVERSITY ORGAN TRANSPLANTATION-GENERAL SURGERY

Organ Transplantation Center Responsible Physician

2012 - 2019, Erzincan/Türkiye

BİNALI YILDIRIM UNIVERSITY DEPARTMENT OF GENERAL SURGERY

Head of Department of General Surgery

2005 - 2012, Erzurum/Türkiye

ERZURUM PALANDÖKEN STATE HOSPITAL GENERAL SURGERY

Specialist