[1] OU Phys Inflammatory Bowel Dis Ctr, Oklahoma City, OK USA
[2] Univ Oklahoma, Hlth Sci Ctr, Donald W Reynolds Dept Geriatr Med, Oklahoma City, OK USA
[3] Univ Oklahoma, Hlth Sci Ctr, Coll Publ Hlth, Biostat & Epidemiol Res Design & Anal Ctr, Oklahoma City, OK USA
[4] Univ Oklahoma, Hlth Sci Ctr, Dept Med, Sect Digest Dis & Nutr, Oklahoma City, OK USA