[1] Univ Campinas UNICAMP, Sch Med Sci, Dept Obstet & Gynaecol, BR-13083881 Campinas, SP, Brazil
[2] Ctr Res Reprod Hlth Campinas Cemicamp, BR-13083888 Campinas, SP, Brazil
[3] Univ Fed Amazonas, Manaus, Amazonas, Brazil
[4] Sch Med Sci, CISAM, Recife, PE, Brazil
[5] Univ Fed Ceara, Fortaleza, Ceara, Brazil
[6] Univ Fed Bahia, Salvador, BA, Brazil
[7] Hosp Geral Cesar Cals, Fortaleza, Ceara, Brazil
[8] Hosp Geral Fortaleza, Fortaleza, Ceara, Brazil
[9] Maternidade Odete Valadares, Belo Horizonte, MG, Brazil
[10] Hosp Materno Infantil, Goiania, Go, Brazil
[11] Inst Materno Infantil Pernambuco, Recife, PE, Brazil
[12] Univ Fed Pernambuco, Recife, PE, Brazil
[13] Univ Fed Campina Grande, Campina Grande, PB, Brazil
[14] Univ Fed Maranhao, Sao Luis, MA, Brazil
[15] Univ Fed Parana, BR-80060000 Curitiba, Parana, Brazil
[16] Univ Fed Paraiba, BR-58059900 Joao Pessoa, Paraiba, Brazil
[17] Hosp Maternidade Fernando Magalhaes, Rio De Janeiro, RJ, Brazil
[18] Univ Fed Rio Grande do Sul, Porto Alegre, RS, Brazil
[19] Hosp Maternidade Celso Pierro, Campinas, SP, Brazil
[20] Inst Fernandes Figueira Fiocruz, Rio De Janeiro, RJ, Brazil
[21] Hosp Israelita Albert Einstein, Sao Paulo, Brazil
[22] Univ State Sao Paulo, Botucatu, SP, Brazil
[23] Jundiai Sch Med, Jundiai, SP, Brazil
[24] Univ Sao Paulo, BR-14049 Ribeirao Preto, SP, Brazil
[25] Santa Casa Limeira, Limeira, SP, Brazil
[26] Santa Casa Sao Carlos, Sao Carlos, SP, Brazil
[27] Maternidade Leonor Mendes de Barros, Sao Paulo, Brazil
[28] Univ Fed Sao Paulo, Sao Paulo, Brazil