Aalborg University Hospital - Department of Obstetrics and Gynaecology, University of Copenhagen - Department of Biostatistics, Nordsjaellands Hospital - Department of Paediatrics and Adolescent Medicine, Nordsjællands Hospital - Department of Cardiology, University of Southern Denmark - Lillebaelt Hospital, University of Copenhagen - Section of Epidemiology, University of Copenhagen, Faculty of Health and Medical Sciences, Department of Public Health, Aalborg University, Faculty of Medicine, Aalborg University Hospital & Clinical Institute, Department of Cardiology and Aalborg University Hospital - Department of Obstetrics and Gynaecology