1 Department of general and digestive surgery, Hautepierre hospital, University hospital of Strasbourg, 1, avenue Molière, 67098 Strasbourg Cedex, France. Electronic address: simone.manfredelli@chru-strasbourg.fr.
2 Department of general and digestive surgery, Hautepierre hospital, University hospital of Strasbourg, 1, avenue Molière, 67098 Strasbourg Cedex, France.