1. Faculty of Medicine, Novi Sad + Clinical Centre of Vojvodina, Clinic for Gynecology and Obstetrics, Novi Sad
2. University Domiciled in Cologne, Clinic of Private Witten/Herdecke, Clinic of Cologne, Department of Pathology, Cologne, Germany
3. Faculty of Medicine, Novi Sad + Selecta Polyclinic, Novi Sad