[1] Stanford Univ, Gastroenterol & Hepatol, Sch Med, Stanford, CA USA
[2] Vet Affairs Palo Alto Healthcare Syst, Gastroenterol & Hepatol, Livermore, CA USA
[3] UT Southwestern Med Ctr, Div Digest & Liver Dis, Dept Internal Med, Dallas, TX USA
[4] Univ Miami, Miller Sch Med,Div Digest Hlth & Liver Dis, Dept Med, Ochsner Clin Fdn, Miami, FL USA
[5] Metrohealth Syst, Gastroenterol & Hepatol, Cleveland, OH USA
[6] Univ Miami, Div Publ Hlth Sci, Div Epidemiol & Populat Hlth Sci, Miller Sch Med, Miami, FL USA
[7] Metrohealth Syst, Cleveland, OH USA
[8] Med Technol & Practice Patterns Inst, Bethesda, MD USA
[9] Univ Calif San Francisco, San Francisco, CA USA