[1] Hosp Univ Virgen Macarena, Dept Obstet & Gynaecol, Seville, Spain
[2] Hosp Santiago Apostol, Dept Obstet & Gynaecol, Vitoria, Spain
[3] Bayer Hispania, Barcelona, Spain
[4] Inst Catala Salut, PASSIR Programa Atencio Salut Sexual & Reprod Bar, Barcelona, Spain
[5] Hosp Severo Ochoa, Dept Obstet & Gynaecol, Madrid, Spain
[6] Hosp Gen Requena, Dept Obstet & Gynaecol, Valencia, Spain
[7] Ayuntamiento Madrid, Ctr Joven Madrid Salud, Madrid, Spain
[8] Ayuntamiento Madrid, Programas Planificac Familiar & Salud Maternoinfa, Madrid, Spain