Page 17 - Best diagnosticians: TOP 340 doctors

Dr. Ulvi Gulmammadov is a Check-Up Physician at Memorial Göztepe Hospital (2025–present). He graduated from the Istanbul University Faculty of Medicine (2001–2008). He is a member of the Turkish Medical Association.

He works in preventive and hospital medicine. He spent 6 years in check-up and occupational practice at Acıbadem Atakent Hospital (2014–2020). He served as Medical Director at Focusmed Health Tourism for 5 years (2020–2025). He worked as a Ward Physician at Taksim German Hospital for 2 years (2012–2014). He also worked 4 years in Emergency Medicine at Emsey Medical Center and Bezmialem Vakıf Gureba Hospital (2008–2012). He has professional training in Occupational Medicine.

Dr. Hakan Harputluoglu is a medical oncologist at Memorial Bahçelievler Hospital in Istanbul (2023–present). He previously worked in the Division of Medical Oncology, Department of Internal Medicine, at İnönü University Faculty of Medicine in Malatya (2017–2023). He also served at Hacettepe University’s Oncology Institute and Division of Oncology in Ankara (2004–2009).

He has been a Professor at İnönü University Faculty of Medicine since 2017. His training includes an Internal Medicine residency at İnönü University (2004–2009) and a medical degree from Hacettepe University Faculty of Medicine.

Dr. Sabahattin Gunduz is a cardiologist at Memorial Göztepe Hospital (2025–present). He previously worked as a cardiology specialist at VM Medical Park Pendik Hospital (2018–2025). He also served at Kartal Koşuyolu Heart Hospital (2014–2018), Tuzla State Hospital (2012–2014), and Ümraniye Training and Research Hospital (2010–2012).

He is a Professor of Cardiology at Bahçeşehir University, Faculty of Medicine (2022). He became an Associate Professor at Istanbul Kartal Koşuyolu High Specialty Training and Research Hospital (2017). He completed his cardiology residency at the same institution (2005–2009). He earned his MD from Istanbul University (1999–2005).

Professional memberships: TTB, TKD, ESC, EAPCI, EACVI.

Dr. Tolga Sinan Guvenc is a cardiologist at Memorial Göztepe Hospital (2025–). He previously worked at VM Medical Park Pendik (2019–2025) and at Dr. Siyami Ersek Thoracic and Cardiovascular Surgery Training and Research Hospital (2014–2018).

He has authored over 200 scientific articles and book chapters. He serves on the Editorial Board of Scientific Reports.

He is a Fellow of the ESC Heart Failure Association. He is also a member of the Turkish Society of Cardiology, the European Society of Cardiology, and Sigma Xi.

Advanced training includes a clinical fellowship in the Advanced Heart Failure Unit at the University of Alberta. He also served as a visiting scientist at the Echocardiography Station at the University of Alabama at Birmingham. Education: MD, Istanbul University Cerrahpaşa (English). Cardiology residency, Dr. Siyami Ersek.

Dr. Mehmet Semih is a cardiology specialist at Memorial Göztepe Hospital (2025–present). He previously served as a specialist at Koşuyolu High Specialty Training and Research Hospital (2024–2025) and Sivas Numune Hospital (2023–2024). He completed his cardiology residency at Istanbul University Cerrahpaşa (2018–2023). He earned his MD at Istanbul University (2006–2012).

He is a member of the Turkish Society of Cardiology, the European Society of Cardiology, and the European Heart Rhythm Association. He has delivered oral case presentations at EHRA and TKD congresses. He also completed the TKD Bifurcation Lesions Management Course and the TKD Echocardiography Symposium.

Dr. Ahmet Mutlu is an ENT specialist at Memorial Göztepe Hospital (2025–present). He holds European Board certification in ORL‑HNS (FEBORL‑HNS, 2018) and National ENT Board certification (2016). Education: MD, Kocaeli University (2011). ENT residency, Kocaeli University (2011–2016). Master’s in Audiology, Başkent University (2017).

Previous posts: Istanbul Medeniyet University (2019–2025). Üsküdar State Hospital (2016–2019). Kocaeli University (2011–2016). Training: Otology‑Neurotology School (2019–2020). Laryngology & Phoniatrics School (2021–2022). Portmann Institute microsurgery course (2013). Memberships: Turkish ORL‑HNS, Istanbul ENT Assoc., Otology‑Neurotology, Phoniatrics, Turkish Medical Association.

Psychiatrist at Memorial Bahçelievler Hospital since 2018. Previously worked at Medical Park Bahçelievler, Trakya University Psychiatry, and Bakırköy Mental Health. MD, Istanbul University Cerrahpaşa. Psychiatry residency at Bakırköy.

Author of 80 publications (53 national, 27 international). Has 330 international citations and 90 presentations. Wrote “Neurotransmitters and Depression” (1988). Contributed 25 book chapters and translated 3 psychiatry books.

Founding member of the Turkish Psychiatric Association and member of APA and ISPG. Awards include the TPA Research Encouragement (2006) and the Mood Disorders Third Prize (2004). Certified CBT psychotherapist (national and European, 2012) and supportive psychotherapist/instructor (2013). Supervised 21 theses. Was an invited speaker at more than 20 congresses and chaired 4. Served on 10 organizing committees. Reviewed 70 papers. Served on the editorial boards of 15 journals. Principal investigator or consultant on 5 projects.

Assoc. Prof. Dr. Saydam Mehmet is a general surgeon at Lokman Hekim Istanbul Hospital (2025–present). His work covers oncologic, endocrine, and metabolic surgery. He performs laparoscopic surgery, including hernia repair and anti-reflux procedures. He also treats morbid obesity and type 2 diabetes. Sleeve gastrectomy is among his key procedures.

Education: He graduated from the Gülhane Military Medical Academy, Faculty of Medicine (1995–2001). He completed his general surgery residency there (2004–2009). He was a research fellow at the University of Miami/Jackson Memorial Hospital, Ryder Trauma Center (2015–2016).

Experience: He worked as a general surgery specialist at GATA Haydarpaşa, Girne Military, and Mevki Military. He later served as Associate Professor of General Surgery at Dışkapı, Sancaktepe, and Medical Park Gebze. Earlier, he practiced as a general practitioner in military medical services.

Dr. João Lima Gabriel is a Family Medicine physician with over 15 years of experience in public and private care. Since 2019, he has been Medical Director at Corporación Dermoestética. He leads clinical teams and oversees weight loss programs, aesthetic medicine, dermatologic care, and facial and body treatments.

He has practiced at Hospital da Luz, CUF, and USF Oriente. He has also mentored National Health System trainees as a clinical tutor. He completed specialization in aesthetic medicine at the University of Córdoba. He is multilingual.

Clinical focus: obesity management, hyperhidrosis, facial rejuvenation, injectables, laser therapies, chemical peels, IPL, mesotherapy, and hair restoration. He provides care with a holistic, individualized approach and clear communication.

Dr. Fulya Gokdagli Sigir is an OB/GYN focused on reproductive medicine. She earned her MD from Istanbul University Cerrahpaşa in 2006. She completed her OB/GYN residency at Istanbul Medeniyet University from 2007 to 2013. During her training, she also completed an observership in perinatology at Frankfurt Bürger Hospital.

From 2013 to 2014, she fulfilled compulsory service at Batman Sason State Hospital. She then served as an Assistant Professor at Medipol Mega University Hospital from 2014 to 2017. Her work focused on obstetrics and gynecologic oncology.

She obtained certification in Assisted Reproductive Treatment Practices in 2017 at Memorial Şişli IVF Center. She then worked for about three years as an IVF specialist. At Kolan International Hospital – Şişli IVF Center, she worked from 2021 to 2025. She served as Responsible Physician from 2023 to 2025. She has been an Assistant Professor at Galata University since 2021. Her interests include IVF, IUI, reproductive endocrinology, endometriosis and adenomyosis, and laparoscopic and hysteroscopic surgery.