1 University of North Carolina School of Medicine (D.R.C.), Chapel Hill, North Carolina 27594; Northwestern University (M.M.), Chicago, Illinois 60611; VA Palo Alto Heath Care System (A.R.H.), Palo Alto, California 94304; Massachusetts General Hospital (A.K.), Boston, Massachusetts 02114; Charite Medical Faculty Berlin (C.J.S.), Germany D-10187; New York School of Medicine (D.L.K.), New York, New York 10016; Princess Alexandra Hospital (K.H.), Brisbane, Australia 4102; Autonomous University of Barcelona (S.M.W.), Barcelona, Spain; Hospital das Clinicas (M.D.B.), Sao Paula, Brazil; Gasthuisberg Campus; Katholieke Universitat (R.B.), Leuven, Belgium; Cedars Sinai Health Center (A.B.-S.), Los Angeles, California 96048; Cleveland Clinic Foundation (A.M.H.), Cleveland, Ohio 44195; Hôpitaux Universitaires Paris-Sud (P.C.), Le Kremlin Bicêtre F-94275, France; University of Michigan Medical Center (A.L.B.), Ann Arbor, Michigan 48109; University of Washington (G.R.M.), Seattle, Washington 98195; Veterans Administration Medical Center (M.R.B.), Washington, DC 20427; and Johns Hopkins School of Medicine (R.S.), Baltimore, Maryland 21287.