Best Phimosis urologists in Istanbul: TOP 25 doctors

Dr. Baris Nuhoglu is a renowned specialist in Urooncology, Endourology, and Pediatric Urology. His career includes roles such as Head of Urology at various institutions, numerous professional memberships, and an extensive list of publications. He is trained in various operations, including High intensity focused ultrasound ablation (HIFU), Nephrectomy, and Robotic da Vinci prostatectomy among others.

PhD. Sökmen graduated from Eskişehir Kılıçoğlu High

School in 2002 and studied at Istanbul Cerrahpaşa

University Medical School in the same year,

graduating in 2008.

Later, he specialized in urology at Bakırköy Urology

Clinic of Dr. Sadi Konuk Training and Research

Hospital was the only clinic in Turkey with European

Accreditation (FEBU) accreditation at the time and

was appointed as Urology Specialist in 2014.

Since becoming a specialist, he has actively

participated in trainings and conferences in the fields

of urological oncology, robotic surgery, renal

transplantation and andrology, and has participated in

numerous surgeries with leading professors from

around the world.

In recent years, he has become particularly interested

in “men’s sexual health and sexual aesthetics” and has

been performing surgeries in this area since 2017.He

continues to perform surgeries and research, including

penile enlargement and regenerative treatments for

erectile dysfunction, penile implant implantation,

chronic prostatitis, sexually transmitted diseases, and

chronic pelvic pain syndrome.

PhD. Sökmen has been a member of the European

Association of Urology since 2009. He has also

organized and served as an instructor for many

accredited training courses for the organization.

2021 Ph.D. Sökmen introduces unique andrology

trends in the field of urology with its portfolio of

treatments, patented devices and regenerative

therapies.He is currently conducting scientific research

and patient examinations at the Andro Expertise

Center for Men’s Health and Aesthetics, which was

opened in 2022 with his colleague Dr. Zulfu Sertkaya

with the same vision. He treats patients in his own

clinic and performs surgeries in affiliated hospitals.

Dr. Sertkaya graduated from Konya Meram Science High School in 2001 and entered Gazi University Medical Faculty the same year, graduating in 2008. He completed his urology specialization at Haydarpaşa Numune Training and Research Hospital in 2014, becoming a urology specialist.

Since becoming a specialist, he has focused on the sub-branch of Andrology, attending various training sessions and conferences and performing surgeries with some of the world's leading Andrology professors. In 2017, he passed the written and oral proficiency exams conducted by the European Association of Urology, earning the title of "FEBU."

In 2020, Dr. Sertkaya achieved the rank of Associate Professor of Urology. His journey in Urology and Andrology, which began in 2008, continues at the Andro Expertise Male Health and Aesthetics Center, which he founded in 2022. He sees patients in his own clinic and performs surgeries at affiliated hospitals.

Specialties

Kidney and urinary tract endoscopic stone crushing treatment

Endoscopic Prostate and Bladder Surgery (TUR Method)

Diagnosis and surgery of testicular diseases

Diagnosis and treatment of infertility in men (Varicocele surgeries)

Diagnosis and treatment of sexual dysfunctions

Treatment of urinary incontinence in women

Treatment of nocturnal incontinence in children

Treatment of undescended testicle in children

Circumcision

Experience

1995-1999 Bilecik State Hospital Urology Clinic

1999-2002 Kocaeli Gölcük State Hospital Urology Clinic

2002-2006 Sakarya Karasu State Hospital Urology Clinic and Chief Physician

2006-2012 Kocaeli State Hospital Urology Clinic and Chief Physician

2012-2015 Kocaeli State Hospital Urology Clinic

2015-2018 Kocaeli Public Hospitals Secretary General

2018-2021 Kocaeli Provincial Health Director

2021-2023 Kocaeli Darıca Farabi Training and Research Hospital Urology Clinic

2023- 2024 Kocaeli Gölcük Necati Çelik State Hospital Urology Clinic

2024 Private Darıca Büyük Anadolu Hospital

Education

Uludag University Faculty of Medicine (graduation) 1988

Selcuk University Faculty of Medicine (specialization) 1994

1982-1988 Uludağ University Faculty of Medicine

1990 -1994 Selcuk University Faculty of Medicine, Department of Urology (Specialization)

Scientific Publications

Acar A., Sert I. Ü., Gürbüz R., Ergüney Ş: Submucosal methotrexate applications in inoperable bladder tumors.  S.Ü.T.F. Journal. 1993; 9(1):39-41

Acar A., Sert İ.Ü., Gürbüz R., Arslan E.M., Ergüney Ş. , : Bladder wall and prostate

Translated with DeepL.com (free version)

Dr. Sılay is an experienced pediatric urologist practicing in Turkey.

Specialty

Assoc. Prof. Selçuk Sılay specializes in robotic surgery for urology conditions in children.

Dr. Selçuk Sılay has provided over:

• 300 pediatric laparoscopic surgeries
• 100 pediatric robotic surgeries
• 300 closed kidney stone surgeries in children.

Work experience

• Since 2018 – Urologist in Memorial Bahçelievler Hospital and Memorial Ataşehir Hospital
• 2017-2018 – Pediatric urology robotic surgery specialist in Mehmet Akif Ersoy Training and Research Hospital
• 2016-2018 – Head of Pediatric Urology Department in Istanbul Medeniyet University Göztepe Training and Research Hospital
• 2011-2016 – Head of Pediatric Urology Department at the Bezmialem Foundation University
• 2009 – Urology Specialist in Diyarbakir Bismil State Hospital
• 2006-2007 – Urology and Robotic Surgery Specialist.

Education

• 1997-2003 – Ankara University Medical School – Degree in general medicine
• 2003 – Baylor College of Medicine (USA) – Training in urology
• 2004-2009 – Istanbul Şişli Hamidiye Etfal Education And Research Hospital – Training in urology
• 2006-2007 – Baylor College of Medicine (USA) – Internship in urology
• 2014-2015 – Texas Children's Hospital (USA) – Pediatric Urology Robotic Surgery Training (USA).

Awards

• 2016 Young Academician of the Year Award by the 24th National Urology Congress in Cyprus
• 2018 Crystal Matula Award as European Academician of the Year.

Scientific activity

Prof. Selçuk Sılay provides research in robotic surgery in children. Has written over 80 articles.

Membership in organizations

• The Turkish Society of Pediatric Urology
• The European Association of Urology
• The European Society for Paediatric Urology
• The Turkish Association of Urology.

Assoc. Prof. Dr. Cenk Acar completed his medical education at Ankara University Faculty of Medicine and his urology residency at Gazi University Faculty of Medicine, Department of Urology. He worked as an assistant professor at Pamukkale University Faculty of Medicine, Department of Urology between June 2009 and November 2012. Between May 2012 and November 2012, he worked as a fellow in robotic and laparoscopic surgery in urologic cancers for 6 months in the Urology Department of “The Netherland Cancer Institute-AVL hospital”. He started to work at Acıbadem Ankara Hospital in November 2012. In September 2014, he completed the necessary academic qualifications and received the title of “Associate Professor”. After working in a private hospital in Ankara between 2015-2020, he continued his services in his private practice in Ankara until 2020 when he started Hisar Intercontinental Hospital.

In 2015, he was the chairman of the organizing committee of the first course on ‘Fluorescence Imaging in Urological Surgery’ in the field of urology in Turkey. In the following years, he chaired many urology and multidisciplinary courses on ICG fluorescence imaging under the umbrella of Urology Associations. In 2017, for the first time in Turkey, he started to apply Bipolar Prostate Enucleation in benign prostate enlargement in his clinic. Later, he started to use his increasing experience in surgeries such as HOLEP and THUFLEP.

In his career, Dr. Acar, who is especially interested in Urological Cancers, Urinary System Stones, HOLEP, THUFLEP, Endourology, and Robotic and Laparoscopic Urological Surgeries, has carried out many successful operations. He has performed over 500 urological cancer surgeries, over 250 HOLEP surgeries, countless endoscopic stone surgeries, and numerous robotic and laparoscopic surgeries.

FIELDS OF MEDICAL INTEREST

• Localized Prostate Cancer Treatments
• Quality of Life in Urological Cancers
• Sentinel Lymph Node Dissections in Prostate Cancer
• Intraoperative Fluorescence Imaging Techniques in Robotic and Laparoscopic Urological Surgery
• Prostate Enucleations in BPH (HOLEP, BIPOLEP, THULEP)
• Urinary System Stone Disease

d                                                                                                                                  d                                                                                                                                        d

Experience

2017 - 2022 Haseki Training and Research Hospital, Associate Professor

2017 - 2022 Haseki Training and Research Hospital

2013 - 2017 Haseki Training and Research Hospital

2013 - 2017 Haseki Training and Research Hospital, Chief Resident

2010 - 2013 Silivri State Hospital (Compulsory Service Obligation)

2008 - 2008 University of Michigan Medical School

2005 - 2010 Istanbul Medical Faculty, Department of Urology

Education

2010 Istanbul University, Istanbul Medical Faculty, Department of Urology

2004 Istanbul University, Istanbul Medical Faculty

Publications

International Peer-Reviewed Journals:

Culpan M, Atis G, Sanli O, Bozkurt Y, Atmaca AF, Semerci B, Kutsal C, Canda AE, Akbulut F, Tugcu V, Boylu U, Erturhan S, Koca O, Ateş F, Halis F, Soyupek S, Turna B, Cakmak S, Sahin S, Erdem S, Yildirim A. "Comparison of Tumor Enucleation and Standard Partial Nephrectomy According to Trifecta Outcomes: A Multicenter Study by the Turkish Academy of Urology, Uro-Oncology Working Group." J Invest Surg. 2022 May;35(5):1112-1118.

Sahan M, Sarilar O, Akbulut MF, Demir E, Savun M, Sen O, Ozgor F. "Flexible ureterorenoscopy and laser lithotripsy with regional anesthesia vs general anesthesia: A prospective randomized study." Int Braz J Urol. 2020 Nov-Dec;46(6):1010-1018.

Cubuk A, Yanaral F, Savun M, Ayranci A, Erbin A, Yazici O, Akbulut MF, Sarilar O. "Modified autologous transobturator tape surgery - evaluation of short-term results." Ginekol Pol. 2020;91(2):51-56.

Kandemir E, Savun M, Sezer A, Erbin A, Akbulut MF, Sarilar Ö. "Comparison of Miniaturized Percutaneous Nephrolithotomy and Standard Percutaneous Nephrolithotomy in Secondary Patients: A Randomized Prospective Study." J Endourol. 2020 Jan;34(1):26-32.

Ucpinar B, Erbin A, Ayranci A, Caglar U, Alis D, Basal S, Sarilar O, Akbulut MF. "Prediction of recurrence in non-muscle invasive bladder cancer patients. Do patient characteristics matter?" J BUON. 2019 Jul-Aug;24(4):1659-1665.

Ozdemir H, Erbin A, Sahan M, Savun M, Cubuk A, Yazici O, Akbulut MF, Sarilar O. "Comparison of supine and prone miniaturized percutaneous nephrolithotomy in the treatment of lower pole, middle pole and renal pelvic stones: A matched pair analysis." Int Braz J Urol. 2019 Sep-Oct;45(5):956-964.

Erbin A, Ucpinar B, Cubuk A, Yazici O, Uysal H, Savun M, Basal S, Akbulut MF. "The Impact of Sheath Size in Miniaturized Percutaneous Nephrolithotomy in Adult Patients; A Matched-pair Analysis." Urol J. 2019 Dec 24;16(6):536-540.

Güler A, Erbin A, Ucpinar B, Savun M, Sarilar O, Akbulut MF. "Comparison of miniaturized percutaneous nephrolithotomy and standard percutaneous nephrolithotomy for the treatment of large kidney stones: a randomized prospective study." Urolithiasis. 2019 Jun;47(3):289-295.

Yanaral F, Ozgor F, Savun M, Agbas A, Akbulut F, Sarilar O. "Shock-wave Lithotripsy for Pediatric Patients: Which Nomogram Can Better Predict Postoperative Outcomes?" Urology. 2018 Jul;117:126-130.

Arslan B, Akbulut MF, Onuk O, Küçüktopçu O, Çilesiz NC, Ozkan A, Yazıcı G. "A comparison of Amplatz dilators and metal dilators for tract dilatation in mini-percutaneous nephrolithotomy." Int Urol Nephrol. 2017 Apr;49(4):581-585.

Akbulut F, Kucuktopcu O, Kandemir E, Ucpinar B, Ozgor F, Simsek A, Arslan B, Erbin A, Yanaral F, Binbay M, Gurbuz G. "Efficacy and safety of mini percutaneous nephrolithotomy in obese patients." Springerplus. 2016 Jul 22;5(1):1148.

Sancak EB, Oguz S, Akbulut T, Uludag A, Akbas A, Kurt O, Akbulut MF. "Female sexual dysfunction in androgenetic alopecia: Case-control study." Can Urol Assoc J. 2016, July;10(7-8):E251-256.

Akbulut F, Kucuktopcu O, Kandemir E, Sonmezay E, Simsek A, Ozgor F, Binbay M, Muslumanoglu AY, Gurbuz G. "Comparison of flexible ureterorenoscopy and mini-percutaneous nephrolithotomy in treatment of lower calyceal stones smaller than 2 cm." Ren Fail. 2016;38(1):163-7.

Tok A, Akbulut F, Buldu I, Karatag T, Kucuktopcu O, Gurbuz G, Istanbulluoglu O, Armagan A, Tepeler A, Tasci AI. "Comparison of microperc and mini-percutaneous nephrolithotomy for medium-sized lower calyx stones." Urolithiasis. 2016 Apr;44(2):155-9.

Akbulut F, Tok A, Penbegul N, Daggulli M, Eryildirim B, Adanur S, Gurbuz G, Celik H, Utangac MM, Dede O, Bodakcı MN, Tepeler A, Sarica K. "Colon perforation related to percutaneous nephrolithotomy: from diagnosis to treatment." Urolithiasis. 2015 Nov;43(6):521-6.

Ozluk Y, Sari S, Guzel NT, Firat P, Akbulut F, Kilicaslan I. "Mixed epithelial and stromal tumor of the kidney with sarcomatous transformation metastatic to the lung: A case report." Anal Quant Cytopathol Histpathol. 2015 Jun;37(3):199-205.

Ozgor F, Kucuktopcu O, Sarilar O, Toptas M, Simsek A, Gurbuz ZG, Akbulut MF, Binbay M. "Does previous open renal surgery or percutaneous nephrolithotomy affect the outcomes and complications of percutaneous nephrolithotomy." Urolithiasis. 2015 Nov;43(6):541-7.

Ugurlu İM, Akman T, Binbay M, Tekinarslan E, Yazıcı Ö, Akbulut MF, Özgör F, Müslümanoğlu AY. "Outcomes of retrograde flexible ureteroscopy and laser lithotripsy for stone disease in patients with anomalous kidneys." Urolithiasis. 2015 Feb;43(1):77-82.

Simsek A, Ozgor F, Kirecci SL, Akbulut MF, Sonmezay E, Yuksel B, Kucuktopcu O, Gurbuz ZG. "Results of tension-free vaginal tape for recurrent stress urinary incontinence after unsuccessful transobturator tape surgery." J Obstet Gynaecol Res. 2014 Jun;40(6):1764-9.

Simsek A, Kirecci SL, Kucuktopcu O, Ozgor F, Akbulut MF, Sarilar O, Ozkuvanci U, Gurbuz ZG. "Comparison of paroxetine and dapoxetine, a novel selective serotonin reuptake inhibitor in the treatment of premature ejaculation." Asian J Androl. 2014 Sep-Oct;16(5):725-7.

Akbulut F, Kucuktopcu O, Sonmezay E, Simsek A, Ozgor F, Gurbuz ZG. "Partial penectomy after debridement of a Fournier's gangrene progressing with an isolated penile necrosis." Ulus Travma Acil Cerrahi Derg. 2014 Sep;20(5):385-8.

Simsek A, Ozgor F, Yuksel B, Kucuktopcu O, Kirecci SL, Toptas M, Sarilar O, Berberoglu AY, Gurbuz ZG, Mimaroglu S, Akbulut F, Baykal M, Arslan B, Savun M, Ucpinar B. "Female sexual function after transobturator tape in women with urodynamic stress urinary incontinence." Springerplus. 2014 Sep 30;3:570.

Akbulut F, Akman T, Salabas E, Dincer M, Ortac M, Kadioglu A. "Neurovascular bundle dissection for Nesbit procedure in congenital penile curvature patients: medial or lateral?" Asian J Androl. 2014 May-Jun;16(3):442-5.

Kadioglu A, Sanli O, Akman T, Canguven O, Aydin M, Akbulut F, Kucukdurmaz F. "Factors Affecting the Degree of Penile Deformity in Peyronie's Disease: An Analysis of 1001 Patients." J Androl. 2011 Sep-Oct;32(5):502-8.

Akman T, Sanli O, Uluocak N, Akbulut F, Nane I, Demir S, Kadioglu A. "The most commonly altered type of Peyronie's disease deformity under oral colchicine treatment is lateral curvature that mostly shifts to the dorsal side." Andrologia. 2011 Feb;43(1):28-33.

Akbulut MF, Sanli O, Kadioglu A. "Editorial Comment on: Are Infertile Men Less Healthy than Fertile Men? Results of a Prospective Case-Control Survey." Eur Urol. 2009 Dec;56(6):1032.

Acar O, Akinci M, Uluocak N, Akbulut F, Kilicaslan I, Gokce O. "Paratesticular metastasis of malignant melanoma: a case report." Kaohsiung J Med Sci. 2008 Jun;24(6):315-8.

Çubuk A, Erbin A, Savun M, Ayranci A, Üçpınar B, Yanaral F, Sarılar Ö, Basal Ş, Akbulut MF. "Autologous transobturator midurethral sling." Turk J Urol. 2018 Dec 21;45(3):230-232.

Sarılar Ö, Özgör F, Küçüktopçu O, Uçpınar B, Akbulut MF, Savun M, Gürbüz ZG, Binbay M. "Is standard percutaneous nephrolithotomy still the standard treatment modality for renal stones less than three centimeters?" Turk J Urol. 2017 Jun;43(2):165-170.

Akbulut F, Savun M, Ucpinar B, Sahan M, Arslan B, Ozgor F, Simsek A, Berberoglu AY, Baykal M, Binbay M. "Duplicated Renal System with H Shaped Ureter: An Extraordinary Anomaly." Case Rep Urol. 2016;2016:4062515.

Akbulut F, Kucuktopcu O, Kandemir E, Sonmezay E, Simsek A, Ucpinar B, Ozgor F, Gurbuz G. "Comparison of efficacy of laser lithotripter with ultrasonic lithotripter in mini percutaneous nephrolithotomy." Arch Ital Urol Androl. 2016 Jan 14;87(4):276-9.

Ozgor F, Simsek A, Aydogdu O, Kucuktopcu O, Sarilar O, Berberoglu AY, Akbulut MF, Binbay M. "Bleeding during laparoscopic partial nephrectomy: Can a hemostatic matrix help to improve hemostasis?"

Areas of Expertise and Interest

• Urological Cancers (Robotic and Laparoscopic Surgery)
• Stone diseases
• Benign prostate hyperplasia
• Minimally invasive prostate treatments (HoLEP, TuLEP, Rezum, TUR-P,..)
• Kidney Diseases
• Prostate Diseases
• Bladder Diseases
• Testis Diseases
• Sexual Dysfunctions - Infertility
• Infections

Education

• Bachelor's / Master's Degree: Faculty of Medicine, Istanbul University, 2006
• PhD: Urology, Bezmialem Vakıf University, 2012

Professional and Observational Experience in Medicine

• Research Assistant, Istanbul University, Istanbul Faculty of Medicine, Department of Anatomy, 10/2006 - 03/2007
• Research Assistant, Bezmialem Valide Sultan Foundation Gureba Training and Research Hospital, Urology Clinic, 08/2007 - 10/2010
• Research Assistant, Bezmialem University, Department of Urology, 10/2010 - 08/2012
• Observer, University of Michigan, Department of Urology, Ann Arbor, MI, USA, 05/2011 - 06/2011
• Specialist, Idil State Hospital, Idil, Şırnak, 11/2012 - 08/2014
• Specialist, Giresun Dr. A. İlhan Özdemir State Hospital, Giresun, 09/2014 - 2015
• Associate Professor, Bezmialem Vakıf University, Department of Urology, 2015 - 2024
• Associate Professor, Medipol Acıbadem Regional Hospital, 2024 - Present

Awards Received

• Effects of Sildenafil Citrate and Serotonin Reuptake Inhibitors on the Expression of Inducible Nitric Oxide Synthase, Endothelial Nitric Oxide Synthase, Neuronal Nitric Oxide Synthase, and Hypoxia-Inducible Factor-1 Alpha in Pulmonary Hypertension-Induced Rat Cavernous Tissues. Ilbey Y.Ö, Şimşek A, Özcan L, Cilli M, Polat E.C, Ersöz C, Somay A, Özbek E. 8th National Andrology Congress (International Participation), İzmir, Turkey, May 20-23. Congress Abstract Book; 22: SS-01 (2009). (Male Sexual Health Alpay Kelami Award)
• Extraperitoneal (EXPERT-ONOL) Sacrocolpopexy in the Treatment of Advanced Uterovaginal and Vaginal Prolapse: Intermediate-Term Results. Önol Ş.Y, Armağan A, Tepeler A, Başıbüyük İ, Ersöz C, Erdem M.R. 22nd National Urology Congress (International Participation), Girne, Turkish Republic of Northern Cyprus, May 02-06. Congress Abstract Book, 369: V-021 (2012).

Certificates

• Prof. Cevper Ersöz has over 130 national and international publications.

Memberships in Scientific Organizations

• Turkish Urology Association
• Turkish Pediatric Urology Association
• Turkish Endourology Association
• European Association of Urology (EAU)
• European Society of Endourology

Education and Experience

Dr. Ramazan Gökhan Atış, born in Istanbul in 1978, graduated from Cağaloğlu Anatolian High School in 1996. He completed his medical education at Çapa Faculty of Medicine in 2002. Between 2002 and 2008, he received his specialization training at the Istanbul Şişli Etfal Training and Research Hospital Department of Urology, and obtained the title of Urology Specialist in February 2008. After working at Edremit Military Hospital between 2008 and 2009, he started working as a Urology specialist at Istanbul Göztepe Training and Research Hospital in 2009. In 2011, he underwent a 3-month Laparoscopy-Robotic Urology training at Heidelberg University Heillbronn Clinic. Between 2009 and 2014, he conducted numerous scientific research studies, especially in the field of endourology, and obtained the title of Associate Professor in September 2014. In 2017, he was elected as a board member of the Endourology Society and has been serving in this position since then. Since 2018, he has been actively involved in the Endourology working group of the European Association of Urology, Young Academic Urologists (EAU-YAU) Committee for a period of 2 years. In January 2021, he was appointed as a Professor at the Istanbul Medeniyet University Department of Urology.After that started working at Şişli Memorial Hospital in 2022. Prof. Dr. Ramazan Gökhan Atış, has more than 100 articles published in national and international journals.

• 1996 - 2002, Istanbul University Istanbul Faculty of Medicine, Undergraduate
• 2002 - 2008, Şişli Etfal Training and Research Hospital/Istanbul, Specialization in Medicine
• 2014, Istanbul Medeniyet University Goztepe Training and Research Hospital, Associate Professorship
• 2021, Istanbul Medeniyet University Department of Urology, Professorship

Administrative Duties

• Editor of Endourology Bulletin
• Board Member of Endourology Society (Secretary General)

Memberships in Scientific Organizations

• Turkish Urology Association
• Turkish Endourology Association
• Turkish Andrology Association
• Eurasian Urooncology Association
• Turkish Medical Association

Education :

University: School of Medicine (English), Marmara University, 1989-1997

Residency: Urology / Urology Clinic, Dr Lütfü Kırdar Kartal Training and Research Hospital 1998-2003

Medical Specialty Thesis and Supervisors: The Role of Nerve Growth Factor in Bladder Outflow Obstruction, Assoc. Prof. Uğur Kuyumcuoğlu, M.D.

Assoc. Prof.: Urology Clinic, Dr Lütfü Kırdar Kartal Training and Research Hospital 2013

Biography :

Resident / Dr. Lütfi Kırdar Kartal Training and Research Hospital (1998 – 2003)

• Army Physician / Sarıkamış 200-Bed Military Hospital (2003-2004)

• Chief Resident / Dr. Lütfi Kırdar Kartal Training and Research Hospital (2004 – 2017)

• Physician / Aydın Atatürk State Hospital (2017)

• Physician / Kocaeli Acıbadem Hospital (2017-2018)

• Physician / Adatıp Hospital (2018-…)

Area of Specialty :

İçerik Yazınız

Memberships :

Turkish Association of Urologic Surgery

Turkish Association of Urology

Turkish Association of Andrology

Society of Endourology

Urooncology Association

Turkish Medical Association