1 Hospices civils de Lyon, Edouard Herriot hospital, Department of Digestive Diseases, 69437 Lyon cedex 03, France; Claude Bernard Lyon 1 University, Lyon, France. Electronic address: jerome.dumortier@chu-lyon.fr.
2 Hospices civils de Lyon, Edouard Herriot hospital, Department of Digestive Diseases, 69437 Lyon cedex 03, France; Claude Bernard Lyon 1 University, Lyon, France.
3 Hospices civils de Lyon, Edouard Herriot hospital, Department of Digestive Radiology, Lyon, France.
4 Claude Bernard Lyon 1 University, Lyon, France; Hospices civils de Lyon, Edouard Herriot hospital, Department of Digestive Radiology, Lyon, France.