[1] Orebro Univ, Dept Med Sci, Orebro, Sweden
[2] Natl Board Hlth & Welf, Huddinge, Sweden
[3] Karolinska Inst, Dept Clin Sci Intervent & Technol, Div Obstet & Gynecol, Stockholm, Sweden
[4] Karolinska Univ Hosp Huddinge, Stockholm, Sweden
[5] Karolinska Inst, Dept Neurobiol Care Sci & Soc, Stockholm, Sweden
[6] Uppsala Univ, Dept Womens & Childrens Hlth, Uppsala, Sweden