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