[1] Emory Univ, Sch Med, Dept Med, Div Gen Internal Med, Atlanta, GA 30303 USA
[2] Massachusetts Gen Hosp, Dept Med, Med, Div Gastroenterol, Boston, MA 02114 USA
[3] Univ Calif San Francisco, Dept Med, Div Hosp Med, San Francisco, CA 94143 USA
[4] Univ Calif San Francisco, Dept Med, Div Gen Internal Med, San Francisco, CA 94143 USA
[5] Boston Univ, Sch Publ Hlth, Dept Global Hlth, Boston, MA USA
[6] Massachusetts Gen Hosp, Biostat Ctr, Boston, MA 02114 USA
[7] Univ Louisville, Dept Med, Louisville, KY 40292 USA
[8] Univ Chicago, Dept Med, 5841 S Maryland Ave, Chicago, IL 60637 USA
[9] Univ Chicago, Dept Pediat, Chicago, IL 60637 USA
[10] Univ Alabama Birmingham, Sch Med, Dept Med, Div Gen Internal Med, Birmingham, AL USA
[11] Brigham & Womens Hosp, Dept Med, Div Gen Internal Med & Primary Care, 75 Francis St, Boston, MA 02115 USA
[12] Massachusetts Gen Hosp, Dept Med, Div Endocrinol, Boston, MA 02114 USA
[13] Massachusetts Gen Hosp, Dept Med, Boston, MA 02114 USA