[1] Jinan Univ, Dept Metab & Bariatr Surg, Affiliated Hosp 1, 613 Huangpu Ave West, Guangzhou 510630, Guangdong, Peoples R China
[2] Med Univ Vienna, Dept Gen Surg, Div Visceral Surg, Vienna, Austria
[3] İstanbul Univ, Bariatr Surg Ctr, Dept Gen Surg, Cerrahpasa Fac Med, Istanbul, Turkiye
[4] Avisena Specialist Hosp, Shah Alam, Malaysia
[5] Iran Univ Med Sci, Rasool e Akram Hosp, Div Minimally Invas & Bariatr Surg, Dept Surg,Minimally Invas Surg Res Ctr,Sch Med, Tehran, Iran
[6] Hazrat E Rasool Hosp, Ctr Excellence, European Branch Int Federat Surg Obes, Tehran, Iran
[7] Univ Coll London Hosp NHS Fdn Trust, Dept Upper Gastrointestinal Surg, London, England
[8] Christus Mugerza Hosp, Chihuahua, Mexico
[9] Alexandria Univ, Fac Med, Gen Surg Dept, Alexandria, Egypt
[10] St Josephs Univ, Med Ctr, Bariatr Surg Minimally Invas & Robot Surg, Paterson, NJ USA
[11] Osped Evangel Betania, Dept Gen Surg, Bariatr & Metab Surg Unit, Naples, Italy
[12] Univ Zurich, Univ Hosp Zurich, Dept Surg & Transplantat, Zurich, Switzerland
[13] Univ Hosp Sussex, St Richards Hosp, Dept Upper Gastrointestinal & Bariatr Surg, Chichester, England
[14] Almazov Natl Med Res Ctr, St Petersburg, Russia
[15] Charles Univ Prague, Dept Gen Surg, Fac Med 1, Dept OB Gyn, Prague, Czech Republic
[16] OB Clin, Prague, Czech Republic
[17] OB Clin, Clin Bariatr & Metab Surg, Prague, Czech Republic