Affiliation: | 1. Medical Sciences Postgraduate Program, Universidade Federal do Rio Grande do Sul , Porto Alegre, Brazil;2. Pediatric Echocardiography Laboratory, Santo Antonio Children's Hospital, Complexo Hospitalar Santa Casa de Porto Alegre , Porto Alegre, Brazil;3. Radiology Department, Santo Antonio Children's Hospital, Complexo Hospitalar Santa Casa de Porto Alegre , Porto Alegre, Brazil;4. Department of Medical Surgery, Universidade Federal de Ciências da Saúde de Porto Alegre, Pediatric Otolaryngology Division , Porto Alegre, Brazil |