[1
]
Department of Obstetrics and Gynecology, Sahlgrenska Academy at Gothenburg University,
Sahlgrenska University Hospital, Gothenburg, Sweden.
[2
]
Research Group Epidemiology of Chronic Diseases, Department of Community Medicine,
Faculty of Health Sciences, UiT The Arctic University of Norway, Tromsø, Norway.
[3
]
Department of Women's and Children's Health, Division of Obstetrics and Gynecology,
Karolinska Institutet, Karolinska University Hospital, Stockholm, Sweden.
[4
]
Department of Obstetrics and Gynecology, University of Helsinki and Helsinki University
Hospital, Helsinki, Finland.
[5
]
Department of Obstetrics & Gynecology, Faculty of Health Sciences, Rigshospitalet
University Hospital, University of Copenhagen, Copenhagen, Denmark.