[1] Baylor Univ, Med Ctr, Dept Internal Med, Dallas, TX USA
[2] VA Boston Healthcare Syst, Dept Internal Med, Boston, MA USA
[3] Harvard Univ, Sch Med, Boston, MA USA
[4] Texas Hlth Presbyterian Hosp Dallas, Dept Internal Med, Dallas, TX USA
[5] Univ Texas Southwestern Med Sch, Dallas, TX USA
[6] Univ Calif Los Angeles, Geffen Sch Med, Dept Internal Med, Los Angeles, CA USA
[7] Brigham & Womens Hosp, Div Gastroenterol, Boston, MA 02115 USA
[8] Univ Calif San Francisco, Med Ctr, Dept Med & Liver Ctr, San Francisco, CA 94143 USA
[9] Mayo Med Sch Clin & Fdn, Ctr Basic Res Digest Dis, Div Gastroenterol & Hepatol, Rochester, MN USA
[10] UT Southwestern Med Ctr, Dept Internal Med, Dallas, TX USA
[11] Univ Calif, San Diego Sch Med, La Jolla, CA USA
[12] Univ Penn, Dept Med, Gastrointestinal Div, Philadelphia, PA 19104 USA
[13] Univ Penn, Dept Genet, Philadelphia, PA 19104 USA
[14] Univ Penn, Abramson Canc Ctr, Philadelphia, PA 19104 USA
[15] Univ Michigan, Sch Med, Dept Mol & Integrat Physiol, Ann Arbor, MI 48109 USA