[1] Univ Chicago, Dept Med, Chicago, IL USA
[2] Univ Illinois, Div Epidemiol & Biostat, Chicago, IL USA
[3] Rush Univ Syst Hlth, Dept Internal Med, Chicago, IL USA
[4] Stanford Univ, Sch Med, Chicago, IL USA
[5] Div Endocrinol, UC San Diego Hlth, San Diego, CA USA