[1] WALTER REED ARMY MED CTR, DEPT CLIN INVEST, ENDOCRINE METAB SERV, 7D, WASHINGTON, DC 20307 USA
[2] WALTER REED ARMY MED CTR, DEPT MED, TRANSPLANTAT IMMUNOL SERV, WASHINGTON, DC 20307 USA
[3] UNIFORMED SERV UNIV HLTH SCI, DEPT MED, BETHESDA, MD 20814 USA
[4] HAMMERSMITH HOSP, ROYAL POSTGRAD MED SCH, DEPT MED, LONDON W12 0HS, ENGLAND
[5] NIAID, BETHESDA, MD 20205 USA