1. Department of Obstetrics and Gynecology, University Hospital “Dragisa Misovic”, 11000 Belgrade, Serbia
2. Faculty of Medicine, University of Belgrade, 11000 Belgrade, Serbia
3. Department of Physical Medicine and Rehabilitation, University Children’s Hospital, 11000 Belgrade, Serbia
4. Institute of Social Medicine, Faculty of Medicine, University of Belgrade, 11000 Belgrade, Serbia
5. Faculty of Medicine, School of Public Health and Health Management, University of Belgrade, 11000 Belgrade, Serbia
6. Department of Medical Statistics and Informatics, School of Dental Medicine, University of Belgrade, 11000 Belgrade, Serbia
7. Clinic for Anesthesiology and Intensive Care, University Hospital “Dragisa Misovic”, 11000 Belgrade, Serbia