[1] Univ Sao Paulo, Hosp Clin, Clin Obstet, Sao Paulo, SP, Brazil
[2] Univ Fed Parana, Fac Med, Dept Obstet & Ginecol, Curitiba, PR, Brazil
[3] Hosp Israelita Albert Einstein, Sao Paulo, SP, Brazil
[4] Hosp Moinhos Vento, Porto Alegre, RS, Brazil
[5] Univ Estado Rio De Janeiro, Rio De Janeiro, RJ, Brazil
[6] Univ Fed Estado Rio De Janeiro, Rio De Janeiro, RJ, Brazil
[7] Univ Sao Paulo, Hosp Univ, Sao Paulo, SP, Brazil