[1] Univ Calif San Diego, Div Gastroenterol, Dept Internal Med, Vet Affairs San Diego Healthcare Syst, San Diego, CA 92103 USA
[2] Univ Calif San Diego, Moores Canc Ctr, San Diego, CA 92103 USA
[3] Univ Miami, Miller Sch Med, Dept Internal Med, Div Gastroenterol, Miami, FL 33136 USA
[4] Univ Penn, Dept Family Med & Community Hlth, Perelman Sch Med, Leonard Davis Inst Hlth Econ,Ctr Clin Epidemiol &, Philadelphia, PA 19104 USA
[5] Univ Penn, Ctr Publ Hlth Initiat, Philadelphia, PA 19104 USA
[6] Southern Calif Kaiser Permanente Grp, San Diego, CA USA
[7] San Francisco Gen Hosp, San Francisco, CA 94110 USA
[8] Univ Calif San Francisco, San Francisco, CA 94143 USA
[9] Univ Michigan, Med Ctr, Div Gastroenterol, Ann Arbor, MI USA
[10] Howard Univ, Dept Med, Div Gastroenterol, Washington, DC 20059 USA
[11] MD Inc, Encinitas, CA USA
[12] Kaiser Northern Calif Div Res, Oakland, CA USA
[13] Alameda Cty Med Ctr, Oakland, CA USA
[14] Univ Texas SW Med Ctr Dallas, Dallas, TX 75390 USA
[15] Grp Hlth Res Inst, Seattle, WA USA
[16] Icahn Sch Med Mt Sinai, Dept Med, Div Gastroenterol, New York, NY USA
[17] Univ Calif San Diego, Dept Family & Prevent Med, La Jolla, CA 92093 USA