The following institutions and individuals participated in this clinical trial: Jay Amsterdam, M.D., University of Pennsylvania, Philadelphia; George Bartzokis, M.D., Little Rock VA Medical Center, North Little Rock, Ark.; Louise Dabiri-Beckett, M.D., IPS Research Company, Oklahoma City; Gary Booker, M.D., IPS Research Company, Shreveport, La.; Ron Brenner, M.D., St. John’s Episcopal Hospital, Far Rockaway, N.Y.; David Brown, M.D., Community Clinical Research, Inc., Austin, Tex.; Timothy Byrd, M.D., Charter Springs Behavioral Clinic, Ocala, Fla.; Franca Centorrino, M.D., McLean Hospital, Belmont, Mass.; James Chou, M.D., Bellevue Hospital, New York; Anthony Claxton, M.D., and Hermant Patel, M.D., University of Oklahoma Health Sciences Center, Oklahoma City; Lori Davis, M.D., VA Medical Center, Tuscaloosa, Ala.; Jose E. De La Gandara, M.D., North Broward Neurological Institute Memory Disorder Center, Pompano Beach, Fla.; G. Michael Dempsey, M.D., Memorial Hospital, Albuquerque, N.Mex.; Rif El-Mallakh, M.D., University of Louisville School of Medicine; Louis Fabre, M.D., Fabre Research Clinics, Houston; David Feifel, M.D., University of California at San Diego Medical Center; Brent Forester, M.D., Mental Health Center of Greater Manchester, Manchester, N.H.; Arthur Freeman III, M.D., Louisiana State University Medical Center, Shreveport, La.; Alan Green, M.D., Massachusetts Mental Health Center, Boston; Sanjay Gupta, M.D., Psychiatric Network, P.C., Olean, N.Y.; Robert Horne, M.D., Lake Meade Hospital, Las Vegas; Fuad Issa, M.D., Clinical Research Center of Northern Virginia, Falls Church, Va.; Robert Jamieson, M.D., Psychiatric Consultants, P.C., Nashville, Tenn.; Christopher Kelsey, M.D., San Diego Center for Research; Louis Ari Kopolow, M.D., Associated Psychotherapy Centers, Gaithersburg, Md.; Jeff Mitchell, M.D., Laureate Psychiatric Clinic and Hospital, Tulsa, Okla.; Cesar Munoz, M.D., University of Alabama at Birmingham; Fred Petty, M.D., Ph.D., VA Medical Center, Dallas; Michael Plopper, M.D., Mesa Vista Hospital, San Diego; Joanchim Raese, M.D., Knollwood Psychiatric and Chemical Dependency Center of Charter Hospital, Murietta, Calif.; Jeffery Rausch, M.D., Medical College of Georgia, Augusta; Robert Riesenberg, M.D., Atlanta Center for Medical Research, Decatur, Ga.; Leon Rubenfaer, M.D., Harbor Oaks Hospital, Farmington Hills, Mich.; John Schmitz, M.D., Midwest Psychiatric Consultants, P.C., Kansas City, Mo.; Taylor Segraves, M.D., Ph.D., MetroHealth Medical Center, Cleveland; Philip Seibel, M.D., Contemporary Behavioral Research, L.L.C., Washington, D.C.; G. Michael Shehi, M.D., Mountain View Hospital, Gadsden, Ala.; Marshall Thomas, M.D., University of Colorado Health Sciences Center, Denver; Kathleen Toups, M.D., Bay Area Research Institute, Lafayette, Calif.; Dan Wilson, M.D., Pauline Warfield Lewis Center, Cincinnati; Tai P. Yoo, M.D., Mercy Hospital, Detroit.