1 Department of General and Digestive Surgery, University Hospitals of Strasbourg, hôpital de Hautepierre, avenue Molière, 67098 Strasbourg cedex, France. Electronic address: benoit.romain@chru-strasbourg.fr.
2 Department of General and Digestive Surgery, University Hospitals of Strasbourg, hôpital de Hautepierre, avenue Molière, 67098 Strasbourg cedex, France.