1. Department of Visceral Surgery, University Hospital of Lausanne, Rue du Bugnon 46, 1011 Lausanne, Switzerland
2. Faculty of Biology and Medicine, University of Lausanne (UNIL), 1015 Lausanne, Switzerland
3. Oeso-Gastric Surgery Unit, Department of Digestive Surgery, Magellan Center, Bordeaux University Hospital, 33600 Pessac, France
4. Faculty of Medicine, Bordeaux Ségalen University, 33000 Bordeaux, France
5. First Department of Surgery, National and Kapodistrian University of Athens, Laikon General Hospital, 11527 Athens, Greece