[1] VA San Diego Healthcare Syst, Gastroenterol Sect, San Diego, CA USA
[2] Univ Calif San Diego, Div Gastroenterol, San Diego, CA 92103 USA
[3] Vanderbilt Univ, Med Ctr, Dept Biostat, Nashville, TN USA
[4] Harvard Univ TH Chan Sch Publ Hlth, Dept Publ Hlth, Boston, MA USA
[5] Vanderbilt Univ, Med Ctr, Dept Biomed Informat, Nashville, TN USA
[6] VA Tennessee Valley, Clin Serv Res & Dev, Nashville, TN USA
[7] VA Tennessee Valley, Hlth Serv Res & Dev, Nashville, TN USA
[8] Corporal Michael J Crescenz VA Med Ctr, Philadelphia, PA USA
[9] Univ Penn, Perelman Sch Med, Philadelphia, PA 19104 USA
[10] VA Boston Healthcare Syst, Boston, MA USA
[11] Harvard Med Sch, Brigham & Womens Hosp, Boston, MA 02115 USA
[12] Univ Calif San Diego, Dept Psychiat, La Jolla, CA 92093 USA
[13] VA San Diego Healthcare Syst, Ctr Excellence Stress & Mental Hlth, San Diego, CA USA
[14] Duke Univ, Med Ctr, Div Gastroenterol, Durham, NC 27710 USA
[15] Durham VA Hlth Care Syst, Gastroenterol Sect, Durham, NC USA
[16] Vanderbilt Univ, Med Ctr, Div Nephrol & Hypertens, Nashville, TN USA
[17] Vanderbilt Univ, Med Ctr, Dept Med, Nashville, TN USA
[18] VA Tennessee Valley Hlth Syst, VA Geriatr Res Educ & Clin Ctr GRECC, Nashville, TN USA