[1] Henry Ford Hlth Syst, Dept Publ Hlth Sci, Detroit, MI USA
[2] Univ Calif Davis, Sch Med, Div Gastroenterol & Hepatol, Davis, CA USA
[3] Mayo Clin, Gastroenterol & Hepatol, Rochester, MN USA
[4] Kaiser Permanente Mid Atlantic States, Midatlantic Permanente Res Inst, Atlanta, GA USA
[5] US FDA, Reagan Udall Fdn, IMEDS, Rockville, MD 20857 USA
[6] Palo Alto Med Fdn, Res Inst, Palo Alto, CA 94301 USA
[7] Essentia Hlth, Essentia Inst Rural Hlth, Duluth, MN USA
[8] Univ Colorado, Skaggs Sch Pharm, Boulder, CO 80309 USA
[9] Marshfield Clin Fdn Med Res & Educ, Res Fdn, Marshfield, WI USA
[10] Geisinger Med Clin, Dept Epidemiol & Hlth Serv Res, Danville, PA USA
[11] Kaiser Permanente Northwest, Ctr Hlth Res, Washington, DC USA
[12] Kaiser Permanente Hawaii, Ctr Hlth Res, Honolulu, HI USA
[13] Kaiser Permanente Southern Calif, Dept Res & Evaluat, Pasadena, CA USA
[14] Baylor Scott & White Res Inst, Dallas, TX USA
[15] Henry Ford Hlth Syst, Ctr Hlth Policy & Hlth Serv Res, Detroit, MI USA
[16] Henry Ford Hlth Syst, Dept Gastroenterol & Hepatol, Detroit, MI USA
[17] Wayne State Univ, Sch Med, Med, Detroit, MI 48202 USA