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