1 Endoscopy Unit, Digestive Diseases Department, Hospital Universitari de Bellvitge, Bellvitge Biomedical Research Institute (IDIBELL), University of Barcelona, Catalonia, Spain.
2 Anesthesiology Department, Hospital Universitari de Bellvitge, Bellvitge Biomedical Research Institute (IDIBELL), University of Barcelona, Catalonia, Spain.
3 Bariatric Surgery Unit, Hospital Universitari de Bellvitge, Bellvitge Biomedical Research Institute (IDIBELL), University of Barcelona, Catalonia, Spain.
4 Esophagogastric Surgery Unit, General Surgery Department, Hospital Universitari de Bellvitge, Bellvitge Biomedical Research Institute (IDIBELL), University of Barcelona, Catalonia, Spain.
5 Endocrinology and Clinical Nutrition Department, Hospital Universitari de Bellvitge, Bellvitge Biomedical Research Institute (IDIBELL), University of Barcelona, Catalonia, Spain.
6 Faculty of Health Sciences, Universitat Oberta de Catalunya, Barcelona, Catalonia, Spain.