1. From the College of Physicians and Surgeons (M.P.), Columbia University, New York, NY; Imperial College School of Medicine (P.A.P-W.), University of London, UK; University of Alberta (P.W.A.), Edmonton, Canada; University of Hull (J.G.F.C.), UK; University of Adelaide (J.H.), Australia; University of California (B.M.M.), San Francisco; Karolinska Institutet (L.R.), Stockholm, Sweden; Aarhus University Hospital (K.T.), Denmark; and University of Texas, Galveston (B.F.U).