McGill University, Montreal, Quebec, Canada (A.N.B.). McGill University, Montreal, Quebec, Canada, and King Saud University, Riyadh, Saudi Arabia (M.A.). Erasmus University Medical Center, Rotterdam, the Netherlands (E.J.K.). Yale School of Medicine, New Haven, Connecticut, and VA Connecticut Healthcare System, West Haven, Connecticut (L.L.). Chinese University of Hong Kong, Hong Kong SAR (J.S., F.K.C., J.L.). McMaster University, Hamilton, Ontario, Canada (F.T., G.I.L., J.D., J.K.M.). Mayo Clinic, Scottsdale, Arizona (N.S.A.). Hospital Parc Tauli de Sabadell, University of Barcelona, Sabadell, Spain, and CiberEHD (Instituto de Salud Carlos III), Madrid, Spain (X.C.). St. Paul's Hospital, University of British Columbia, Vancouver, British Columbia, Canada (R.E.). Technion-Israel Institute of Technology, Emek Medical Center, Afula, Israel (I.M.G.). Western University, London, Ontario, Canada (V.J.). University of California, Los Angeles, Los Angeles, California (D.J.). University of Liverpool and Liverpool Heart and Chest Hospital, Liverpool, United Kingdom, and Aalborg University, Aalborg, Denmark (G.Y.L.). Dijon-Bourgogne University Hospital, Dijon, France (R.L., M.B.). University of Sao Paulo, Sao Paulo, Brazil (F.M.). George Washington University, Washington, DC (A.C.M.). Asian Institute of Gastroenterology, Hyderabad, India (N.R.). Brigham and Women's Hospital, Harvard Medical School, Boston, Massachusetts (J.R.S.).