1. Clinic for Orthopedic Surgery and Traumatology, University Clinical Center of Serbia, Pasterova 2, 11000 Belgrade, Serbia
2. School of Medicine, University of Belgrade, Dr Subotica 8, 11000 Belgrade, Serbia
3. Institute for Oncology and Radiology of Serbia, Pasterova 14, 11000 Belgrade, Serbia
4. Institute for Mother and Child Health Care of Serbia, Radoja Dakica 6-8, 11070 Belgrade, Serbia
5. Center for Anesthesiology and Resuscitation, University Clinical Center of Serbia, Pasterova 2, 11000 Belgrade, Serbia