1 PEDEGO Research Unit, Medical Research Centre Oulu, Oulu University Hospital and University of Oulu, Oulu, Finland.
2 Public Health Promotion Unit, National Institute for Health and Welfare, Helsinki and Oulu, Finland.
3 Northern Finland Laboratory Centre NordLab, Department of Clinical Chemistry and MRC Oulu, Oulu University Hospital and the University of Oulu, Oulu, Finland.
4 Department of Government Services, National Institute for Health and Welfare, Helsinki, Finland.
5 University of Turku and Turku University Hospital, Institute of Clinical Medicine, Internal Medicine, Turku, Finland.
6 Department of General Practice and Primary Health Care, University of Helsinki and Helsinki University Hospital, Helsinki, Finland.
7 Folkhälsan Research Center, Helsinki, Finland.
8 Singapore Institute for Clinical Sciences, Agency for Science, Technology, and Research, Singapore.
9 Department of Obstetrics and Gynaecology, Yong Loo Lin School of Medicine, National University of Singapore, Singapore.
10 Department of Obstetrics and Gynaecology, Tampere University Hospital and Tampere University, Faculty of Medicine and Health Technology, Tampere, Finland.
11 Medical and Clinical Genetics, University of Helsinki and Helsinki University Hospital, Helsinki, Finland.
12 Institute for Molecular Medicine Finland, Helsinki Institute of Life Science, University of Helsinki, Helsinki, Finland.
13 National Institute for Health and Welfare, Information Services Department, Helsinki, Finland.
14 Karolinska Institute, Department of Neurobiology, Care Sciences and Society, Stockholm, Sweden.
15 Department of Obstetrics and Gynaecology, Hospital District of South Ostrobothnia, Seinäjoki, Finland.
16 Department of Obstetrics and Gynaecology, Kainuu Central Hospital, Kajaani, Finland.
17 Department of Obstetrics and Gynaecology, Satakunta Health Care District, Pori, Finland.
18 Department of Obstetrics and Gynaecology, Central Finland Health Care District, Jyväskylä, Finland.
19 Department of Obstetrics and Gynaecology, South Karelia Social and Health Care District, Lappeenranta, Finland.
20 Department of Obstetrics and Gynaecology, University of Helsinki and Helsinki University Hospital, Helsinki, Finland.
21 Lunenfeld-Tanenbaum Research Institute, Mount Sinai Hospital, Toronto, ON, Canada.
22 Children's Hospital, University of Helsinki and Helsinki University Hospital, Helsinki, Finland.
23 Department of Clinical and Molecular Medicine, Norwegian University of Science and Technology, Trondheim, Norway.