1. From the Massachusetts General Hospital and Harvard Medical School (M.H.P.), Boston; Boston Medical Center (R.D., L.A.M.), Boston, Mass; New England Research Institutes (L.A.S.), Watertown, Mass; St. Paul’s Hospital (C.R.T.), Vancouver, BC, Canada; University of Alberta Hospital (V.D.), Edmonton, Alberta, Canada; Winthrop University Hospital (R.S.), Mineola, NY; Vancouver Hospital and Health Science Center (K.G.), Vancouver, BC, Canada; Green Lane Hospital (H.D.W.), Auckland, New Zealand; and St....