[1] Digest Associates Houston, Houston, TX 77030 USA
[2] Baylor Coll Med, Texas Childrens Hosp, Sect Pediat Gastroenterol & Nutr, Houston, TX 77030 USA
[3] Digest Hlth Associates, Dallas, TX 75208 USA
[4] Univ Texas Hlth Sci Ctr San Antonio, Div Gastroenterol & Nutr, San Antonio, TX 78229 USA