[1] Vestre Viken Hosp Trust, Baerum Hosp, Dept Gynecol & Obstet, POB 800, N-3004 Baerum, Drammen, Norway
[2] Univ Gothenburg, Sahlgrenska Acad, Gillberg Neuropsychiat Ctr, Gothenburg, Sweden
[3] Univ Oslo, Inst Clin Med, Fac Med, Oslo, Norway
[4] Natl Hosp Norway, Oslo Univ Hosp, Women & Childrens Div, Oslo, Norway
[5] Oslo Univ Hosp, Norwegian Resource Ctr Womens Hlth, Oslo, Norway