[1] Kaiser Permanente Southern Calif, Dept Res & Evaluat, 100 S Robles Ave,Fifth Floor, Pasadena, CA 91101 USA
[2] Univ Southern Calif, Sch Med, Div Endocrinol & Diabet, Los Angeles, CA USA
[3] Kaiser Permanente Southern Calif, Obstet & Gynecol, Pasadena, CA USA