[1] Univ Arkansas Med Sci, Dept Pediat, Div Allergy Immunol, Little Rock, AR 72205 USA
[2] Arkansas Childrens Hosp, 800 Marshall St, Little Rock, AR 72202 USA
[3] Univ Arkansas Med Sci, Dept Pediat, Div Biostat, Little Rock, AR 72205 USA
[4] Univ Arkansas Med Sci, Dept Pathol, Little Rock, AR 72205 USA
[5] Pediat Gastroenterol Associates, Little Rock, AR USA
[6] Pediat Clin, North Little Rock, AR USA
[7] Univ Arkansas Med Sci, Dept Pediat, Little Rock, AR 72205 USA