1. Clinic of Obstetrics and Gynaecology, Institute of Clinical Medicine, Faculty of Medicine, Vilnius University, M. K. Čiurlionio Str. 21/27, LT-03101 Vilnius, Lithuania
2. Faculty of Medicine, Vilnius University, M. K. Čiurlionio Str. 21/27, LT-03101 Vilnius, Lithuania
3. Faculty of Medicine, Lithuanian University of Health Sciences, A.Mickevičiaus Str. 9, LT-44307 Kaunas, Lithuania