[1] Trinity Mother Frances Hosp & Clin, Dept Gastroenterol Hepatol & Endoscopy, Tyler, TX 75702 USA
[2] Konkuk Univ, Dept Internal Med, Sch Med, Seoul, South Korea
[3] Univ Texas SW Med Ctr Dallas, Dept Clin Sci Biostat, Dallas, TX 75390 USA
[4] Univ Texas SW Med Ctr Dallas, Dept Psychiat, Dallas, TX 75390 USA
[5] Univ Texas SW Med Ctr Dallas, Div Digest & Liver Dis, Dept Internal Med, Dallas, TX 75390 USA