[1] Univ Fed Sao Paulo, Escola Paulista Med, Dept Pediat, BR-01410020 Sao Paulo, SP, Brazil
[2] Univ Sao Paulo, Fac Med, Hosp Clin Sao Paulo, Inst Crianca, Sao Paulo, Brazil
[3] Univ Estadual Campinas, Dept Pediat, Campinas, SP, Brazil
[4] Univ Estadual Sao Paulo Julio Mesquita Neto, Fac Med Botucatu, Dept Pediat, Botucatu, SP, Brazil
[5] Pontificia Univ Catolica Rio Grande do Sul, Dept Pediat, Porto Alegre, RS, Brazil
[6] Fundaco Oswaldo Cruz, Inst Fernandes Figueira, Neonatal Dept, Rio De Janeiro, Brazil
[7] Univ Sao Paulo, Fac Med Ribeirao Preto, Dept Pediat, Ribeirao Preto, Brazil
[8] Univ Fed Rio Grande do Sul, Dept Pediat, Porto Alegre, RS, Brazil