Open Access Macedonian Journal of Medical Sciences; Vol 6, No 5 (2018): May 20 (OAMJMS); 835-838 Open Access Macedonian Journal of Medical Sciences; Vol 6 No 5 (2018): May 20 (OAMJMS); 835-838 Open Access Macedonian Journal of Medical Sciences Open Access Macedonian Journal of Medical Sciences, Vol 6, Iss 5, Pp 835-838 (2018)