[1] Arkansas Childrens Hosp, Pediat Pulmonol, 800 Marshall St, Little Rock, AR 72202 USA
[2] Univ Arkansas Med Sci, Radiol, Little Rock, AR 72205 USA
[3] Arkansas Childrens Hosp, Pediat Radiol, 800 Marshall St, Little Rock, AR 72202 USA
[4] Arkansas Children Hosp, Pediat Pulmonol, Little Rock, AR USA
[5] Univ Arkansas Med Sci, Biostat, Little Rock, AR 72205 USA