[1] HARVARD UNIV, MED SCH, DEPT MED, BOSTON, MA 02115 USA
[2] MASSACHUSETTS GEN HOSP, ENDOCRINE UNIT, BOSTON, MA 02114 USA
[3] JOHNS HOPKINS UNIV, SCH MED, DEPT MED, BALTIMORE, MD 21218 USA
[4] JOHNS HOPKINS HOSP, BALTIMORE, MD 21218 USA
[5] NHLI, EXPTL THERAPEUTICS BRANCH, SECT NEUROENDOCRINOL, BETHESDA, MD 20014 USA