1. From the Veterans Affairs Medical Center (P.K., A.M., A.P., M.D., A.G., D.B.P., C.F., P.N., S.S.), Washington, DC; Georgetown University (P.K., S.S.), Washington, DC; Asklepeion General Hospital (A.M.), Athens, Greece; Harokopion University (D.B.P.), Athens, Greece; Veterans Affairs Palo Alto Health Care System (J.M.), Stanford, Calif; and Stanford University (J.M.), Stanford, Calif..