Institut Hospitalo-Universitaire (IHU), Institute for Minimally Hybrid Invasive Image-Guided Surgery, Université de Strasbourg, Strasbourg, France; Institut de Recherche sur les Cancers de l'Appareil Digestif (IRCAD), Strasbourg, France; General Digestive and Endocrine Surgery Service, Nouvel Hôpital Civil, Strasbourg, France. Electronic address: