1. School of Health Sciences; University of Tampere; Tampere Finland
2. UKK Institute for Health Promotion; Tampere Finland
3. Department of Obstetrics and Gynecology; Tampere University Hospital; Tampere Finland
4. National Institute for Health and Welfare; Helsinki Finland
5. Department of Neurology; Oulu University Hospital and University of Oulu; Oulu Finland
6. Pediatric Research Center; University of Tampere; Medical School; Tampere Finland