[1] Uppsala Univ, Dept Womens & Childrens Hlth, SE-75185 Uppsala, Sweden
[2] Sophiahemmet Univ, Stockholm, Sweden
[3] Uppsala Univ, Dept Psychol, Uppsala, Sweden
[4] Karolinska Inst, Dept Clin Sci & Educ, Stockholm, Sweden
[5] Umea Univ, Dept Clin Sci Obstet & Gynaecol, Umea, Sweden
[6] Linkoping Univ, Fac Hlth Sci, Dept Clin & Expt Med, Linkoping, Sweden
[7] Karolinska Inst, Dept Womens & Childrens Hlth, Stockholm, Sweden
[8] Orebro Univ Hosp, Dept Obstet & Gynaecol, Orebro, Sweden