[1] Royo Villanova University Hospital,Esophagogastric and Bariatric Surgery Unit, General and Digestive System Surgery Department
[2] 12 de Octubre University Hospital,Healthcare Quality Unit
[3] 12 de Octubre University Hospital,Research and Scientific Support Unit
[4] Galdakao-Usansolo Hospital,General and Digestive System Surgery Department
[5] 12 de Octubre University Hospital,General and Digestive System Surgery and Abdominal Organ Transplant Department
[6] Biosfer Teslab,Esophagogastric and Bariatric Surgery Unit, General and Digestive System Surgery and Abdominal Organ Transplant Department
[7] 12 de Octubre University Hospital,undefined