[1] Baylor Coll Med, Dept Med, 2002 Holcombe Blvd MS152, Houston, TX 77030 USA
[2] Baylor Coll Med, Sect Gastroenterol & Hepatol, Houston, TX 77030 USA
[3] Michael E DeBakey VA Med Ctr, Houston, TX USA
[4] Aga Khan Univ, Dept Med, Karachi, Pakistan
[5] Michael E DeBakey VA Med Ctr, Ctr Innovat Qual Effectiveness & Safety IQuESt, Houston, TX USA
[6] Baylor Coll Med, Dept Med, Sect Hlth Serv Res, Houston, TX 77030 USA
[7] Texas Med Ctr, Ctr Digest Dis, Houston, TX USA
[8] Dan L Duncan Canc Ctr, Houston, TX USA
[9] Michael E DeBakey VA, CTRID, Houston, TX USA
[10] Baylor Coll Med, Dept Psychiat, Houston, TX 77030 USA