1. Department of Obstetrics and Gynecology,
2. Department of Pediatrics, and
3. Department of Medicine, Kuopio University Hospital, Kuopio, Finland,
4. Siilinjärvi Health Center, Siilinjärvi, Finland,
5. Department of Pediatrics, University of Eastern Finland and Kuopio University Hospital, Kuopio, Finland, and
6. Department of Obstetrics and Gynecology, University of Helsinki and Helsinki University Central Hospital, Helsinki, Finland