[1] Vanderbilt Univ, Div Pediat Gastroenterol Hepatol & Nutr, Med Ctr, DOT 11226,2200,Childrens Way, Nashville, TN 37232 USA
[2] Temple Univ, Dept Internal Med, Philadelphia, PA USA
[3] Vanderbilt Univ, Div Adult Gastroenterol Hepatol & Nutr, Med Ctr, Nashville, TN USA
[4] East Tennessee State Univ, Quillen Coll Med, Johnson City, TN USA
[5] Tennessee Valley Hlth Syst Vet Affairs, Nashville, TN USA