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