Affiliation: | 1. Center for Functional GI and Motility Disorders, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina, USA;2. Faculty of Health Sciences, Ben-Gurion University of the Negev, Beer-Sheva, Israel;3. Department of Health Research Methods, Evidence and Impact, McMaster University, Hamilton, Ontario, Canada Population Health Research Institute, McMaster University, Hamilton, Ontario, Canada |