Page 5 - Best bariatric surgeons: TOP 207 doctors

Specializing in weight loss surgery for over 25 years, Dr. Tekelioglu performs advanced procedures at Florence Nightingale Hospital.

• Trained at Istanbul University Cerrahpasa – one of Turkey's top medical schools
• Specializes in gastric sleeve, bypass, and Da Vinci techniques
• Fluent in English for international patients
• Long-term experience at a leading private hospital

Position:

Associate Professor ,

General Surgery Department

ISTANBUL MEDIPOL UNIVERSITY PENDIK HOSPITAL General Surgery Department

PERSONAL INFORMATION

Birth Date: 14.05.1982 

Place of Birth      : Şanlıurfa, Türkiye

Married, father of one.

CITIZENSHIP:

Republic of Turkey

EDUCATION:

Specialization:

General Surgery Department

Istanbul Kartal Dr. Lütfü Kırdar Training and Research Hospital (2009- 2014)

University

Istanbul University Istanbul Faculty of Medicine (20022008)

Anadolu University Faculty of Business Administration - Administration of Health Institutions (2013-2015)

Anadolu University Faculty of Open Education Department of Law (2016-)

High school

Erzincan Science High School (1998-2002)

Working Experience:

ERZINCAN NEVZAT AYAZ SCIENCE HIGH SCHOOL 1998-2002

ISTANBUL UNIVERSITY ISTANBUL FACULTY 2002-2009

GENERAL SURGERY ASSISTANT ISTANBUL KARTAL DR. LUTFI KIRDAR TRAINING AND RESEARCH HOSPITAL 2009-2014

SPECIALIST PHYSICIAN MEDENIYET UNIVERSITY GOZTEPE TRAINING AND RESEARCH HOSPITAL 2014-2015

CHIEF PHYSICIAN T.R.  MINISTRY OF HEALTH SILOPI STATE HOSPITAL 2015-2016

SPECIALIST PHYSICIAN T.R. MINISTRY OF HEALTH DERINCE TRAINING AND RESEARCH HOSPITAL, 2018-2020

SPECIALIST PHYSICIAN SANLIURFA MEHMET AKIF INAN TRAINING AND RESEARCH HOSPITAL 2016-2018

ASSOCIATE PROFESSOR ISTANBUL KARTAL DR. LUTFI KIRDAR CITY HOSPITAL 2020-2023

İSTANBUL MEDIPOL UNIVERSITY PENDIK HOSPITAL 2023-

PUBLICATIONS

National and International Articles

1 GÖK MEHMET ALİ, KAFADAR MEHMET TOLGA (2021). Inguinal hernia repair via laparoscopic transabdominal preperitoneal (TAPP) method: Our 2 years clinical results. Annals of Medical Research, 28(4), 812-815., Doi: 10.5455/annalsmedres.2020.05.443

2 SAĞIROĞLU ŞÜKRİYE JÜLİDE, ÖZDEMİR TUĞRUL, ATAK TUBA, GÖK MEHMET ALİ, ORHUN ERDOĞAN KIVILCIM, EREN TURGUT TUNÇ, ALİMOĞLU ORHAN (2016). Laparoscopic Total Extraperitoneal Inguinal Hernia Repair Without Mesh Fixation: Report of Early Outcomes. SouthernPrint Date :22/10/2022 17:41:41 Clinics of Istanbul Eurasia, 27(3), 215-219., Doi: 10.14744/scie.2017.64872 

3 ÇİFTÇİ ALİ, GÖK MEHMET ALİ, KAFADAR MEHMET TOLGA (2022). Management of Acute Biliary Pancreatitis in Cholecystectomized Patients. Bezmiâlem Science, 10(4), 507-511. Doi: 10.14235/ bas galenos. 2021.6708

4 GÖK MEHMET ALİ, YEĞEN SERKAN FATİH, KAFADAR MEHMET TOLGA, KOCAOĞLU AYTAÇ EMRE (2022). Gastrointestinal Stromal Tümörlerde İmmünohistokimyasal Markırların ve Tümör Boyutunun Prognoz Üzerindeki Rolü. Kocaeli Tıp Dergisi, 10(2), 101-104. M-784-1650 KAFADAR MEHMET TOLGA, GÖK MEHMET ALİ (2022). Laparoscopic transabdominal preperitoneal repair of strangulated femoral hernia: Superiority of an unusual emergency surgical approach due to a case. Annals of Medicine and Surgery, 36(1), 110-112.

5 GÖK MEHMET ALİ, KARADAYI BÜYÜKÖZSOY AYŞEGÜL, KAFADAR MEHMET TOLGA (2022). The sensitivity of ultrasound in the clinical diagnosis of inguinal hernias in adults: a comparative study. Journal of Ultrasound, 1-4., Doi: 10.1007/s40477-021-00641-4

6 KARADAYI BÜYÜKÖZSOY AYŞEGÜL, KARATAY EMRAH, GÖK MEHMET ALİ (2022). Comparison of the Effectiveness of Ultrasound Imaging and Perioperative Measurement in the Diagnosis and Characterization of Incisional Hernia. Journal of Medical Ultrasound, 1-5.

7 GÖK MEHMET ALİ, DEMİR MUSTAFA, YEĞEN SERKAN FATİH, KAFADAR MEHMET TOLGA, ŞENOL METİN, KOCAOĞLU AYTAÇ EMRE, AKIN EMRAH (2022). Endoscopic Intra-gastric Botulinum Toxin A for Obesity Treatment: IsIt Effective?. Kocaeli Tıp Dergisi, 11(2), 149-152.

8 GÖK MEHMET ALİ, KARATAY EMRAH, ÇİFTÇİ ALİ (2022). İnguinal Hernilerde Balonsuz ve Mesh Sabitleyicisiz Laparoskopik Total Ekstraperitoneal Onarımın Cerrahi Deneyim ile Korelasyonu. Dicle Medical Journal, 49(3), 498-503., Doi: 10.5798/dicletip.1170263

9 KAFADAR MEHMET TOLGA, GÖK MEHMET ALİ (2022). Effects of Carvedilol on Liver İschemiaReperfusion İnjury in Rats. Ulusal Travma ve Acil Cerrahi Dergisi-Turkish Journal of Trauma & Emergency Surgery, 28(7), 885-893.

10 ŞENOL METİN, GÖK MEHMET ALİ (2022). Small Bowel Obstruction due to Phytobezoar. Kocaeli Tıp Dergisi, 11(2), 1-6.

11 KARATAY EMRAH, GÖK MEHMET ALİ, JAVADOV MIRKHALIG (2021). Measurement of hiatal surface area and other hiatus oesophageal diameters at computed tomography imaging in patients with gastroesophageal reflux disease and its relationship with hiatal hernia. Journal of Minimal Access Surgery, 17(4), 537-541., Doi: 10.4103/jmas.JMAS_175_20

12 GÖK MEHMET ALİ, KAFADAR MEHMET TOLGA, YEĞEN SERKAN FATİH (2021). Perforated colorectal cancers; clinical outcomes \nof 18 patients who underwent emergency surgery. Gastroenterology Review, 16(2), 161-165., Doi: 10.5114/pg.2021.106667

13 YEĞEN SERKAN FATİH, KAFADAR MEHMET TOLGA, GÖK MEHMET ALİ (2020). Comparison of Perioperative Standard and Immunomodulating Enteral Nutrition in Patients Received Major Abdominal Cancer Surgery: a Prospective, Randomized, Controlled Clinical Trial. Indian Journal of Surgery, 82, 828-834., Doi: 10.1007/s12262-020-02114-0 

14 GÖK MEHMET ALİ, KAFADAR MEHMET TOLGA, YEĞEN SERKAN FATİH (2020). Effects of Preoperative Oral Carbohydrate Loading on Preoperative and Postoperative Comfort in Patients Planned to Undergo Elective Cholecystectomy: A Prospective Randomized Controlled Clinical Trial. Iranian Red Crescent Medical Journal, 22(11), 1-6., Doi: 10.32592/ircmj.2020.22.11.107

15 GÖK MEHMET ALİ, KAFADAR MEHMET TOLGA, YEĞEN SERKAN FATİH (2019). Comparison of negative-pressure incision management system in wound dehiscence: A prospective, randomized, observational study. Journal of Medicine and Life, 12(3), 276-283., Doi: 10.25122/jml-2019-0033

16 KAFADAR MEHMET TOLGA, YALÇIN METİN, DADÜK YILDIRAY, SOYALP MURAT, GÖK MEHMET ALİ (2018). Laparoscopic Cholecystectomy for Acute Cholecystitis in Situs Inversus Totalis: An Extraordinary Approach. Eurasian Journal of Emergency Medicine, 17(2), 82-84.

17 KAFADAR MEHMET TOLGA, TEKER İBRAHİM, GÖK MEHMET ALİ, UĞURLU ESAT TAYLAN, ÇETİNKAYA ISMAİL (2018). Atraumatic splenic rupture secondary to abscess in a hemodialysis patient: a rare and fatal cause of acute abdomen diagnosed late. Journal of Surgical Case Reports,5, 1-3., Doi: 10.1093/jscr/rjy103

18 KAYA FERUDUN, KAFADAR MEHMET TOLGA, KISMET KEMAL, GÖK MEHMET ALİ, ERTAŞ ERTUĞRUL (2018). Congenital Transmesenteric Hernia Without Bowel Strangulation in a Young Adult. The Medical Bulletin Of Haseki, 56(4), 337-340., Doi: 10.4274/haseki.galenos.2022.8361

19 GÖK MEHMET ALİ, KAFADAR MEHMET TOLGA, GÜNEŞ ABDULLAH (2018). Laparoscopic treatment of hepatic hydatid disease: Şanlıurfa-Turkey experience and early clinical outcomes. Laparoscopic Endoscopic Surgical Science, 25(3), 98-102., Doi:14744/less.2018.4353171203046744-1078.03 Basım Tarihi 22/10/2022 17:41:41 Sayfa: 2

20 KAFADAR MEHMET TOLGA, YALÇIN METİN, GÖK MEHMET ALİ, AKTAŞ AYŞEGÜL, YÜREKLİ TACİTTİN SEMİH, ARSLAN AYŞEGÜL İSAL (2017). intraparenchymal Leiomyoma of the Breast: A Rare Location for an Infrequent Tumor. intraparenchymal Leiomyoma of the Breast: A Rare Location for an Infrequent Tumor, 13(3), 156-168., Doi: 10.5152/ejbh.2017.3472

 21 GÖK MEHMET ALİ, KAFADAR MEHMET TOLGA, ÖTER VOLKAN (2017). Early-term elective laparoscopic resection after endoscopic detorsion in cases with sigmoid colonic volvulus. Annals of Clinical and Analytical Medicine, 8(6), 492-495., Doi: 10.4328/JCAM.5231

22 KAFADAR MEHMET TOLGA, GÖK MEHMET ALİ, ÖTER VOLKAN (2017). Late-diagnosed penetrating stab Wounds in diaphragm and herniation. Annals of Clinical and Analytical Medicine, 8(4), 367-369., Doi: 10.4328/JCAM.5103

23 ANADOLULU ALİ İHSAN, KAFADAR MEHMET TOLGA, GÖK MEHMET ALİ, ANADOLULU ZEYNEP (2017). Laparoscopic spleen-preserving distal pancreatectomy with splenic vessel preservation for pancreatic pseudocyst in a 10-year-old boy. Journal of Pediatric Surgery Case Reports, 34(1), 10-12.

Proceedings

National and International Proceedings

İnguinal Hernilerde Total Ekstraperitoneal Onarımda Balon Disseksiyonu ile Teleskopik Disseksyonun   Kıyaslanması, KAFADAR MEHMET TOLGA, GÖK MEHMET ALİ (2022). 22.. Ulusal Cerrahi Kongresi, 

İNSİZYONEL HERNİLERDE LAPAROSKOPİK VE KONVANSİYONEL ONARIM YÖNTEMLERİ ARASINDAPOSTOPERATİF AĞRI, GÖK MEHMET ALİ, JAVADOV MIRKHALIG (2021). 8.. Ulusal Fıtık Kongresi

Laparaskopık total ekstraperıitoneal (TEP) onarımında redükte edilemeyen keseler enerji

cıihazıyla lıigate edılebırlıir mı , KAFADAR MEHMET TOLGA, GÖK MEHMET ALİ (2019). 7..

Ulusal Fıtık Kongresi

TEK İNSİZYON LAPARASKOPİK TOTAL EKSTRAPERİTONEAL İNGUİNAL HERNİ ONARIMI DENEYİMİMİZ, GÖK MEHMET ALİ, DEMİR MUSTAFA (2019). 14.. Endoskopik Laparoskopik Cerrahi Kongresi

Laparaskopik Sleeve Gastrektomide 3D Görüntüleme Sisteminin Etkiniliği , GÖK MEHMET ALİ, KAYA FERUDUN, KAFADAR MEHMET TOLGA, AKSOY BAŞAR (2017). 2.. Bariatrik ve Metabolik Cerrahi Kongresi

İnsizyonel hernide laparaskopik preperitoneal onarım, GÖK MEHMET ALİ, KAFADAR MEHMET TOLGA (2017).. 9.. Cerrahi Araştırma Kongresi

ERCP Yapılan Kist Hidatikli Hastalarda Kist Küçülür mü, YALÇIN METİN, GÖK MEHMET ALİ, KAFADAR MEHMET TOLGA (2017).. 13.. Türk Hepatopankreatobilier Cerrahi Kongresi

İnsizyonel Hernilerde TAPP Onarım Mümkün mü, GÖK MEHMET ALİ, AKSOY BAŞAR, KAFADAR MEHMET TOLGA, YALÇIN METİN (2017).. 6.. Ulusal Fıtık Kongresi, (Özet bildiri)

HİATAL HERNİLERDE LAPAROSKOPİK YAKLAŞIM, GÖK MEHMET ALİ, YALÇIN METİN, KAFADAR MEHMET TOLGA, YILMAZ TACETTİN SEMİH, AKTAŞ AYŞEGÜL (2017).. 13.. Endoskopik Laparoskopik Cerrahi Kongresi

KLİNİĞİMİZDE İNGUİNAL HERNİDE 3 TEKNİĞİN KARŞILAŞTIRLMASI, YALÇIN METİN, GÖK MEHMET ALİ, ÇEKİÇ TOLGA FARUK, KABALAK BİLAL, ÖTER VOLKAN, AKTAŞ AYŞEGÜL (2017). Ulusal Endoskopik Laparoskopik Cerrahi Kongresi

Kolon Divertikül  Perforasyonlarında Hartmann Prosedürü veya Primer Anastomoz? , GÖK MEHMET ALİ, KEŞKÜŞ BRAHIM H. HÜDAVERDI, BÖZKURT AHMET ÇAĞLAR, YALÇIN METİN, YILMAZ TACETTİN SEMİH (2017).. 11.. Ulusal Travma ve Acil Cerrahi Kongresi, (Özet bildiri)

GASTROİNTESTİNAL PREKANSEROZ LEZYONLARDA ENDOSKOPİK MUKOZAL REZEKSİYONUN ROLÜ, ORMAN SÜLEYMAN, GÖK MEHMET ALİ, EREN TURGUT TUNÇ, LEBLEBİCİ METİN, ALİMOĞLU ORHAN (2015). 12.. Ulusal Endoskopik Laparoskopik Cerrahi Kongresi

PİYES MAMAOGRAFİSİNDE KİTLE YOK! NE YAPILMALIM, ESER MEHMET, HATİPOĞLU HAYAT, GÜNDOĞAN ERSİN, GÖK MEHMET ALİ, ÇETİN KENAN, ACAR AYLİN, TAN SEDAT, BİLDİK NECDET (2014).. 19.. Ulusal Cerrahi Kongresi

LAPAROSKOPİK KOLESİSTEKTOMİ YAPILAN HASTALARDA TROKAR YERİ FITIĞI GELİŞİMİNDE ETKİLİ OLABİLECEK FAKTÖRLERİN ARAŞTIRILMASI, GÖK MEHMET ALİ, KÜNDEŞ MUHAMMED FİKRİ, KEMENT METİN, ATICI ALİ EMRE, KAPTANOĞLU LEVENT, İLHAN NOYAN, CAN UĞUR, BİLDİK NEJDET, VURAL SELAHATTİN (2014).. 19.. ULUSAL CERRAHİ KONGRESİ 

Books

Written sections in international books

1)Genel Cerrahide Nadir Görülen Acil ve Elektif Vakalar, Bölüm adı:(Akciğere Fistülize Karaciğer Kist Hidatik Vakasına Acil Laparoskopik Yaklaşım) (2020)., COŞKUN MURAT, GÖK MEHMET ALİ,

Akademisyen Yayınevi, Editör: Ender ANILIR Mehmet BAYRAK Mehmet Tolga KAFADAR Mert TANAL Ali Emre NAYCI Hüseyin KILAVUZ Özlem Öndeş BAYAR, Basım sayısı:1, Sayfa Sayısı 655, ISBN:978- 625-7275-23-1, Türkçe(Bilimsel Kitap)

2)Gastrointestinal Sistem Kanserlerinin Cerrahisi, Bölüm adı:(Karaciğerin Primer Solid MalignNeoplazileri) (2020)., GÖK MEHMET ALİ, Akademisyen Yayınevi, Editör: Hüseyin Özgür AYTAÇ, Basım sayısı:1, Sayfa Sayısı 404, ISBN:978-605-258-949-6, Türkçe (Bilimsel Kitap)

3)Gastrointestinal Sistem Tümörleri-1, Bölüm adı:(ERKEN EVRE HASTALIKTA CERRAHİ TEDAVİ) (2019)., GÖK MEHMET ALİ, Akademisyen Yayınevi, Basım sayısı:1, Sayfa Sayısı 493, ISBN:978-605-258-551-1, Türkçe (Bilimsel Kitap)

Editorship

1) Minimal İnvaziv Cerrahi, Kitap, Editör, Akademisyen Kitapevi A.Ş., 22.10.2020-15.07.2021

2. YENİ NESİLCERRAHİ, Kitap, Editör, Akademisyen Kitapevi A.Ş., 15.06.2021-15.08.2022

3. Onkolojik Cerrahi, Kitap, Editör, Akademisyen Kitapevi A.Ş., 05.04.2021-05.12.2021

4.. Fıtık Cerrahisi, Kitap, Editör, Akademisyen Kitapevi A.Ş., 07.04.2020-07.11.2020

Certificates

Hernia A to Z Fundemantals Hands on Workshop, Laparoscopic Hernia Surgery Experience Certificate in Cadaver was awarded by the European Hernia Society.

. DUBAİ/ U.A.E, 28.11.2018 

CADAVER TRAINING EVENT IN COLON AND RECTAL SURGERY, Robotic Colorectal Surgery in Cadaver training certificate was given.  STONY BROOK UNİVERSİTY / NEWYORK/ USA,.04.2016

Memberships in Scientific Organizations:

1.. Turkish Society of Colon and Rectum Surgery, Member, 2020

2.. Turkish Surgical Association, Member, 2014

Specializes in dermatology with over 10 years of experience, focusing on both medical and cosmetic skin treatments.

• Expert in treating acne, eczema, and psoriasis
• Performs surgical excision of suspicious skin lesions
• Offers dermal fillers and laser treatments for skin rejuvenation
• Provides pediatric dermatology services

Dr Derya Zengin Metli specializes in Physical Therapy and Rehabilitation, helping patients restore mobility and reduce pain.

• Expert in musculoskeletal and neurological rehabilitation
• Focuses on post-surgical recovery and chronic pain management
• Patient-centered approach with individualized rehabilitation programs

Specializing in Gastroenterology and Bariatric Surgery at La Madonnina Clinic, Dr. Fausto De focuses on comprehensive weight loss solutions.

• Handles cases of Obesity with a multidisciplinary approach
• Experienced in managing Gastritis and Stomach Ulcers related to weight issues
• Skilled in Bariatric Surgery techniques for effective weight management

Dr. Akkaya brings over 35 years of dermatology expertise, specializing in both medical and cosmetic skin treatments.

• Expert in treating psoriasis, eczema, acne, and vitiligo
• Specializes in dermato-oncology and skin tumor treatments
• Offers advanced laser and light-based therapies
• Provides cosmetic procedures like fillers and chemical peels

Specialist in general surgery with extensive experience in weight loss procedures. Currently practicing at Memorial Bodrum Hospital with a focus on comprehensive surgical care.

• Member of multiple prestigious surgical associations including the Turkish Society of Surgery
• Trained at Istanbul University Cerrahpaşa Faculty of Medicine
• Participated in advanced surgical courses in Germany and Turkey
• Fellowship-trained in oncoplastic breast surgery and thyroid procedures

Nivit Karla specializes in Weight Loss Surgery at PrimeCare Bkk, combining cardiology expertise with surgical precision.

• Trained at Siriraj Medical School and Rajavithi Hospital
• Extensive experience in internal medicine and cardiology
• Offers consultations in both English and Thai

Dyt. Yaren Nur Güngör designs personalized nutrition plans for weight management and metabolic conditions at Ümran Tıp Merkezi.

• Specializes in diabetes, thyroid disorders, and cardiovascular diseases
• Creates evidence-based diet programs for long-term health
• Focuses on sports nutrition for performance enhancement
• Provides pediatric and adolescent nutrition counseling

Dr. Ozlem Yogurtcu specializes in minimally invasive weight loss surgeries, offering faster recovery and improved patient comfort at Ümran Tip Merkezi.

• Fluent in English, ensuring clear communication with international patients
• Expert in gastrointestinal and endocrine surgeries, including gallbladder and thyroid operations
• Provides comprehensive surgical care with a patient-centered approach
• Skilled in laparoscopic procedures for weight loss

3,000+ bariatric surgeries performed – Professor Prager leads the Obesity Outpatient Clinic at Vienna General Hospital.

• President of the IFSO-European Chapter
• Heads the Metabolic Surgery Center at Confraternitaet Private Hospital
• Member of multiple international bariatric surgery societies
• Specializes in all types of bariatric procedures

Prof. Selin Kapan is a leading general surgery expert with over 20 years of experience in weight loss procedures at Istanbul's top hospitals.

• Professor of General Surgery with extensive academic and clinical background
• Specializes in advanced laparoscopic techniques for weight loss surgery
• Active member of Turkish Surgical and Hepato-Pancreato-Biliary Surgery Associations
• Published 50+ scientific papers on surgical techniques and outcomes

Dr. Cevat Azeroglu specializes in advanced radiological diagnostics, offering precise imaging services to aid in medical decision-making.

• Graduated from Tabriz University Faculty of Medicine
• Specialized in Radiology at Ondokuz Mayıs University
• Expert in conventional radiology, ultrasound, CT, and MRI imaging
• Provides interventional radiology for minimally invasive procedures
• Focuses on oncological imaging for cancer staging and follow-up

Dr Erdem Gelegen specializes in Ophthalmology, with expertise in cataract and refractive surgery at ÜMRAN TIP MERKEZİ.

• Over 20 years of experience in ophthalmology
• Skilled in phacoemulsification and premium intraocular lens implantation
• Expert in laser techniques for vision correction
• Treats retinal diseases like diabetic retinopathy and macular degeneration

Expert in weight loss programs and bariatric surgery nutrition – Dr. Serenay guides patients through personalized dietary plans at Büyük Anadolu Hospitals.

• Specializes in nutrition for bariatric surgery patients
• Focuses on diabetes and cardiovascular disease dietary management
• Provides tailored programs for pregnancy and breastfeeding nutrition

Associate Professor Mehmet Akif Aydin specializes in bariatric surgery at Medical Park Bahçelievler Hospital with 20+ years of experience.

• Member of the Society of Bariatric and Metabolic Surgery
• Trained at Istanbul University Cerrahpaşa Faculty of Medicine
• Specializes in advanced laparoscopic techniques for weight loss surgery
• Associate Professor with extensive experience in metabolic procedures

Honor graduate from Hacettepe University – specializes in obesity-related nutrition with research on insulin resistance and hedonic eating behaviors.

• Completed Bariatric Nutrition and Innovations in Obesity courses
• Expert in post-bariatric surgery nutrition and chronic disease diets
• Worked at Hacettepe University Hospitals and Ekol Hospital
• Fluent in English for international patients

Dr. Chen brings international expertise in advanced aesthetic techniques to weight loss surgery, trained in Seoul, Singapore, and Italy.

• Specializes in minimally-invasive body contouring techniques
• Trained in Korean advanced fat transfer methods
• Fellowship in cadaver dissection for deep plane procedures
• Hands-on experience with rib cartilage techniques
• International training across Asia and Europe

1,100+ bariatric procedures performed – Dr. Karatas specializes in metabolic and bariatric surgery at Dr. K Clinics.

• 25+ years focused specifically on metabolic surgical interventions
• Trained in advanced laparoscopy techniques for minimally invasive procedures
• Member of ESPEN and the Turkish Surgery Association
• Performs sleeve gastrectomy and specialized Type 2 diabetes surgeries