1. GYNECOLOGY AND OBSTETRICS WARD, THE DISTRICT HOSPITAL IN DZIALDOWO, DZIALDOWO, POLAND
2. GYNECOLOGY AND OBSTETRICS WARD, THE PROVINCIAL SPECIALIST HOSPITAL IN BIALA PODLASKA, BIALA PODLASKA, POLAND
3. DEPARTMENT OF OBSTETRICS AND PREGNANCY PATHOLOGY, POMERANIAN MEDICAL UNIVERSITY IN SZCZECIN, SZCZECIN, POLAND