[1] JOHNS HOPKINS UNIV HOSP, DEPT SURG, BALTIMORE, MD 21205 USA
[2] NCI, SURG BRANCH, BETHESDA, MD 20892 USA
[3] NCI, ANESTHESIA BRANCH, BETHESDA, MD 20892 USA
[4] NHLI, HYPERTENS BRANCH, BETHESDA, MD 20892 USA
[5] NICHHD, DEV ENDOCRINOL BRANCH, BETHESDA, MD 20892 USA