[1] Univ Estadual Paulista, Dept Gynecol & Obstet, Botucatu Med Sch, Ave Prof Mario Rubens Guimaraes Montenegro S-N, BR-18618687 Botucatu, SP, Brazil
[2] Univ Fed Rio Grande do Sul, Dept Gynecol & Obstet, Fac Med, Porto Alegre, RS, Brazil
[3] Univ Sao Paulo, Dept Gynecol & Obstet, Fac Med, Ribeirao Preto, SP, Brazil
[4] Ctr Univ Lusiada, Dept Tocoginecol, Santos, SP, Brazil
[5] Pontificia Univ Catolica Sao Paulo, Dept Obstet & Gynecol, Fac Med, Sao Paulo, SP, Brazil
[6] Univ Fed Amazonas, Dept Maternal & Child Hlth, Fac Med, Manaus, Amazonas, Brazil
[7] Univ Estadual Campinas, Dept Gynecol & Obstet, Fac Med Sci, Campinas, SP, Brazil
[8] Univ Fed Minas Gerais, Dept Gynecol & Obstet, Fac Med, Belo Horizonte, MG, Brazil
[9] Univ Fed Sao Paulo, Paulista Sch Med, Sao Paulo, SP, Brazil
[10] Univ Fed Uberlandia, Dept Obstet & Gynecol, Fac Med, Uberlandia, MG, Brazil
[11] Pontificia Univ Catolica Rio Grande do Sul, Gynecol & Obstet Training Ctr, Sch Med, Porto Alegre, RS, Brazil