1. Medical School, Board of Surgery, University of Belgrade, Belgrade, Serbia
2. Department of Pediatric Cardiothoracic Surgery, Institute for Mother and Child Health Care of Serbia “Dr Vukan Čupić”, Belgrade, Serbia
3. Department of Anaestesiology, Institute for Mother and Child Health Care of Serbia “Dr Vukan Čupić”, Belgrade, Serbia
4. Department of Radiology, Institute for Mother and Child Health Care of Serbia “Dr Vukan Čupić” Belgrade, Serbia