Dray Xavier, Giday Samuel A
Division of Gastroenterology and Hepatology, Johns Hopkins Hospital, Baltimore, Maryland, USA, Hôpital Lariboisière, Assistance Publique, Hôpitaux de Paris, Université Paris 7, Paris, France.
Gastrointest Endosc. 2007 Nov;66(5):995-6. doi: 10.1016/j.gie.2007.06.005.