Affiliation: | (1) Division of Obstetrics and Gynecology, Department of Clinical Sciences, Karolinska Institutet at Danderyd Hospital, Stockholm, Sweden;(2) Department of Medical Epidemiology and Biostatistics, Karolinska Institutet, Stockholm, Sweden;(3) Department of Medicine, Clinical Epidemiology Unit, Karolinska Institutet, Stockholm, Sweden;(4) Department of Obstetrics and Gynecology, Danderyd Hospital, SE-182 88 Stockholm, Sweden |