Open Access Macedonian Journal of Medical Sciences Open Access Macedonian Journal of Medical Sciences; Vol 3, No 1 (2015): Mar 15 (OAMJMS); 63-68 Open Access Macedonian Journal of Medical Sciences, Vol 3, Iss 1, Pp 63-68 (2015) Open Access Macedonian Journal of Medical Sciences; Vol. 3 No. 1 (2015): Mar 15 (OAMJMS); 63-68