1. Neuroscience and Gastrointestinal Research GroupsDepartment of Physiology and BiophysicsUniversity of Calgary Calgary Alberta T2N 4N1 Canada
2. Douglas Hospital Research CentreDepartment of PsychiatryMcGill University Montreal Quebec H4H 1R3 Canada
3. Department of ChemistryUniversity of Quebec in Montreal Montreal Quebec H3C 3P8 Canada
4. Ferring Research Institute Paris France