Sergej M Ostojic1, Patrik Drid2, Jelena Ostojic3. 1. Biomedical Sciences Department, Faculty of Sport and Physical Education, University of Novi Sad, Serbia; University of Belgrade School of Medicine, Belgrade, Serbia. 2. Biomedical Sciences Department, Faculty of Sport and Physical Education, University of Novi Sad, Serbia. 3. Clinical Center of Vojvodina, Novi Sad, Serbia.