1. Departments of Physiology (P.E.M., G.W., Y.K., L.T., M.B.W., A.M.F.S., H.Y.G.), Toronto, Ontario, Canada M5S 1A8
2. Medicine (G.W., Y.K., L.T., M.B.W., A.M.F.S., H.Y.G.), Toronto, Ontario, Canada M5S 1A8
3. Department of Physiology and Pharmacology (S.T., C.D., I.L.), Sackler School of Medicine, Tel-Aviv University, Tel-Aviv, Israel 69978
4. Surgery (M.S.C.), University of Toronto, Toronto, Ontario, Canada M5S 1A8
5. Department of Surgery (J.R.T.L.), University of Alberta, Edmonton, Canada T6N 2N8