In the per-protocol analysis , @ infants were included in group A , @ in group B , @ in group C , and @ in group D. @ ( @ % ) infants failed treatment in group A compared with @ ( @ % ) infants in group B ( risk difference -@ % , @ % CI -@ to @ ) , @ ( @ % ) in group C ( -@ % , -@ to @ ) , and @ ( @ % ) in group D ( -@ % , -@ to @ ) .