1 Complejo Asistencial Universitario de León, General and Digestive Surgery Department, León, Spain. Electronic address: jherrerak@saludcastillayleon.es.
2 Whittington Hospital, General Surgery Department, London, United Kingdom.
3 STMU Shifa College of Medicine, General Surgery Department, Islamabad, Pakistan.
4 Leyla Medical Center, General Surgery Department, Baky, Azerbaijan.
5 University of Health Sciences Tepecik Training and Research Hospital, Department of General Surgery, Izmir, Turkey.
6 University Hospital North Midlands-Keele University Medical School, General Surgery Department, Stoke on Trent, United Kingdom.
7 Saint George's University Hospitals NHS Foundation Trust, General Surgery Department, London, United Kingdom.
8 The First Affiliated Hospital of Jinan University, General Surgery Department, Guangzhou, China.
9 Department of Thoracic Surgery, Inselspital, Bern University Hospital, University of Bern, 3012 Bern, Switzerland.
10 Croydon University Hospital, Department of General Surgery, London, United Kingdom.
11 Istanbul Medeniyet University, General Surgery Department, Istanbul, Turkey.
12 Shrewsbury and Telford Hospital NHS Trust, General Surgery Department, Shrewsbury, United Kingdom.
13 South Tees Hospitals NHS Foundation Trust-James Cook University Hospital, General Surgery Department, Cleveland, United Kingdom.