1. Department of Obstetrics and Gynaecology, University of Tartu, Tartu, Estonia, Tartu Youth Counselling Centre, Tartu, Estonia,
2. Department of Epidemiology and Biostatistics, National Institute for Health Development, Tallinn, Estonia, Estonian Centre of Behavioural and Health Sciences, Tallinn/Tartu, Estonia
3. Department of Obstetrics and Gynaecology, University of Tartu, Tartu, Estonia