[1] USN, NATL MED CTR, DEPT MED, BETHESDA, MD 20814 USA
[2] NIAMDDK, CLIN ENDOCRINOL BRANCH, BETHESDA, MD 20205 USA
[3] UNIFORMED SERV UNIV HLTH SCI, BETHESDA, MD 20014 USA
[4] UNIV CHICAGO, DEPT MED, THYROID STUDY UNIT, CHICAGO, IL 60637 USA
[5] UNIV KENTUCKY, DEPT PEDIAT, LEXINGTON, KY 40536 USA
[6] UNIV TEXAS, MED BRANCH, DIV PEDIAT ENDOCRINOL, GALVESTON, TX 77550 USA