[1] San Francisco VA Med Ctr, San Francisco, CA USA
[2] Univ Wisconsin, Madison, WI USA
[3] Univ Washington, Seattle, WA 98195 USA
[4] Vanderbilt Inst Med & Publ Hlth, Nashville, TN USA
[5] NYU, Sch Med, New York, NY USA
[6] RTI Int, Washington, DC USA
[7] Yale Univ, Sch Med, New Haven, CT USA
[8] Vet Affairs Connecticut Healthcare Syst, New Haven, CT USA
[9] Massachusetts Gen Hosp, Boston, MA 02114 USA
[10] Brigham & Womens Hosp, Boston, MA 02115 USA
[11] Mayo Clin & Mayo Grad Sch Med, Rochester, MN USA
[12] Univ N Carolina Hosp, Chapel Hill, NC USA
[13] Crohns Colitis Fdn Amer, Houston, TX USA
[14] Univ Virginia, Charlottesville, VA USA
[15] Johns Hopkins Univ, Sch Med, Baltimore, MD USA
[16] Univ Calif San Francisco, San Francisco, CA 94143 USA