[1] Case Western Reserve Univ, Div Clin & Mol Endocrinol, Cleveland, OH 44106 USA
[2] Univ Hosp Cleveland, Div Endocrinol, Cleveland, OH 44106 USA
[3] George Washington Univ, Dept Biostat & Epidemiol, Washington, DC 20052 USA
[4] Harvard Univ, Sch Med, Dept Med, Boston, MA 02115 USA