Maria Helena Müller Dittrich1, Werther Brunow de Carvalho, Edson L Lavado
1Hospital Universitario de Londrina, Londrina, Parana, Brazil; Pediatrics Department, Faculdade De Medicina, Universidade de São Paulo, São Paulo, Brazil; Universidade Estadual De Londrina, Londrina, Parana, Brazil.
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