[1] Univ So Calif, Keck Sch Med, Dept Family Med, Los Angeles, CA 90033 USA
[2] Univ So Calif, Keck Sch Med, Dept Prevent Med, Los Angeles, CA 90033 USA
[3] Johns Hopkins Bloomberg Sch Publ Hlth, Baltimore, MD USA
[4] Univ So Calif, Keck Sch Med, Div Endocrinol, Los Angeles, CA 90033 USA