Full text: Available Index: LILACS (Americas) Main subject: Pediatrics / Randomized Controlled Trials as Topic / Databases, Bibliographic / Biomedical Research Type of study: Controlled clinical trial Language: Spanish Journal: Rev. chil. pediatr Journal subject: Pediatrics Year: 2010 Type: Article Affiliation country: Argentina Institution/Affiliation country: Hospital Italiano de Buenos Aires/AR / Hospital Privado/AR / Hospital de Niños Pedro de Elizalde/AR