1. Department of Perinatology, Division of Obstetrics and Gynaecology, University Medical Centre Ljubljana, Slajmerjeva 3, 1000 Ljubljana, Slovenia
2. Medical Faculty, University of Ljubljana, Vrazov trg 2, 1000 Ljubljana, Slovenia
3. Department of Anaesthesiology and Intensive Therapy, University Medical Centre Ljubljana, Slajmerjeva 3, 1000 Ljubljana, Slovenia
4. Institute of Anatomy, Medical Faculty, University of Ljubljana, Vrazov trg 2, 1000 Ljubljana, Slovenia