1 Sciense, New York, USA; Department of Neurosurgery, Lausanne University Hospital, Lausanne, Switzerland.
2 Department of Gastroenterology, CHU Saint-Pierre, Brussels, Belgium.
3 Department of Surgery, University of Mons, Mons, Belgium.
4 Department of Surgery, University of Mons, Mons, Belgium; Department of Otolaryngoly-Head Neck Surgery, Foch Hospital, University of Paris Saclay, Paris, France; Polyclinic of Poitiers, Poitiers, France. Electronic address: [email protected].