1 Faculty of Medicine of Angers, Angers, France. auvenara@yahoo.fr.
2 Department of Visceral and Endocrinal Surgery (Service de chirurgie viscérale et endocrinienne), CHU Angers, 4, Rue Larrey, 49933, Angers Cedex 9, France. auvenara@yahoo.fr.
3 UMR INSERM U1235, TENS, The Enteric Nervous System in Gut and Brain Disorders, Institut des Maladies de l'Appareil Digestif, 1, Rue Gaston Veil, 44035, Nantes, France. auvenara@yahoo.fr.
4 Institut Paoli-Calmette, 232 Boulevard de Sainte Marguerite, 13009, Marseille, France.
5 Department of Visceral Surgery, CHU Lyon, Centre Hospitalier Lyon-Sud, 69495, Pierre-Bénite Cedex, France.
6 Université de Lyon, Lyon, France.
7 Department of Visceral Surgery, CHU Tours, 2 Boulevard Tonnelé, 37000, Tours, France.
8 UMR INSERM U1235, TENS, The Enteric Nervous System in Gut and Brain Disorders, Institut des Maladies de l'Appareil Digestif, 1, Rue Gaston Veil, 44035, Nantes, France.
9 Department of Visceral Surgery, CHU Nantes, 1 Place Alexis Ricordeau, 44000, Nantes, France.
10 Department of Visceral Surgery, Clinique de l'Alliance, 1 Boulevard A Nobel, 37540, Saint Cyr Sur Loire, France.
11 Department of Abdominal Surgery, UZ Leuven, Herestraat 49, 3000, Leuven, Belgium.
12 Department of Visceral Surgery, CHU Amiens, Avenue Laennec, 80054, Amiens, France.
13 Hirslanden Clinique La Colline, Geneva, Switzerland.
14 Department of Methodology and Biostatistics, CHU Angers, 4 Rue Larrey, 49933, Angers Cedex 9, France.
15 Department of Anesthesiology, CHU Liège, Domaine de Sart Tilman, Université de Liège, 4000, Liege, Belgium.
16 Department of Visceral Surgery, CHU Clermont-Ferrand, 63003, Clermont-Ferrand, France.