1. Riga Maternity Hospital, Miera Street 45, LV-1013 Riga, Latvia
2. Gynaecology Clinic, Riga East Clinical University Hospital, Hipokrata Street 2, LV-1079 Riga, Latvia
3. Department of Obstetrics and Gynaecology, Rīga Stradiņš University, Miera Street 45, LV-1013 Riga, Latvia
4. Department of Clinical Skills and Medical Technologies, Rīga Stradiņš University, Anninmuizas Bulvaris 26a, LV-1067 Riga, Latvia