1. University of Helsinki; Helsinki Finland
2. Department of Obstetrics and Gynecology; Lohja Hospital; Lohja Finland
3. Department of Obstetrics and Gynecology; Porvoo Hospital; Porvoo Finland
4. Finnish Medical Society Duodecim; Helsinki Finland
5. Department of Obstetrics and Gynecology; Helsinki University Central Hospital; Helsinki Finland
6. Hospital District of Helsinki and Uusimaa; Administration/Research and Development; Helsinki Finland
7. Hospital District of Helsinki and Uusimaa; External Evaluation Unit; Helsinki Finland