Karagjozova, I., Petrovska, S., Nikolic, S., Maleska-Ivanovska, V. and Georgievska-Ismail, L. (2017) “Frequency of Electrocardiographic Changes in Trained Athletes in the Republic of Macedonia”, Open Access Macedonian Journal of Medical Sciences, 5(6), pp. 708–713. doi: 10.3889/oamjms.2017.174.