1. Digestive Physiology, Hospices Civils de Lyon, Université de Lyon, Lyon, France;
2. Biostatistical Department, Hospices Civils de Lyon, LBBE, Université de Lyon, Lyon, France;
3. Gastroenterology and Physiology Department, CHU de Rennes, Rennes, France;
4. Gastroenterology Department, Hôpital Avicenne, APHP, Bobigny, France.