1. Clinical Centre of Serbia, Clinic for Gynecology and Obstetrics, Belgrade
2. Clinical Centre of Serbia, Clinic for Gynecology and Obstetrics, Belgrade + Medical Faculty, Belgrade
3. Santa Maria Hospital, Department of Obstetrics and Gynecology, Bari, Italy
4. Vito Fazzi Hospital, Division of Experimental Endoscopic Surgery, Imaging, Technology and Minimally Invasive Therapy of Centre for Interdisciplinary Research Applied to Medicine Department of Obstetrics and Gynecology, Lecce, Italy.