[1] NIMH, SOCIOENVIRONM STUDIES LAB, BETHESDA, MD 20892 USA
[2] UNIV MARYLAND, COLLEGE PK, MD 20742 USA
[3] WALTER REED ARMY MED CTR, WALTER REED ARMY INST RES, DEPT MIL PSYCHIAT, WASHINGTON, DC 20307 USA
[4] UNIFORMED SERV UNIV HLTH SCI, DEPT PSYCHIAT, BETHESDA, MD 20814 USA