[1] Univ Fed Rio Grande Sul, Dept Obstet & Ginecol, Porto Alegre, RS, Brazil
[2] Clin Geral Fertilizacao Assistida, Porto Alegre, RS, Brazil
[3] Univ Luterana Brasil, Dept Fisiol, Porto Alegre, RS, Brazil
[4] Univ Heidelberg, Dept Gynecol Endocrinol & Reprod Med, Heidelberg, Germany