1. J.J. Strossmayer University, Department for Gynecology and Obstetrics, Osijek, Croatia + Clinical Hospital, Clinic for Gynecology and Obstetrics, Osijek, Croatia
2. J.J. Strossmayer University, Department for Gynecology and Obstetrics, Osijek, Croatia + Vukovar General Hospital, Department for Gynecology and Obstetrics, Vukovar, Croatia
3. Clinical Hospital, Clinic for Gynecology and Obstetrics, Osijek, Croatia
4. Clinical Hospital, Institute for Pathology and Forensic Medicine, Osijek, Croatia