Zafirova-Ivanovska, B., Stojkovikj, J., Dokikj, D., Anastasova, S., Debresliovska, A., Zejnel, S. and Stojkovikj, D. (2016) “The Level of Cholesterol in COPD Patients with Severe and Very Severe Stage of the Disease”, Open Access Macedonian Journal of Medical Sciences, 4(2), pp. 277–282. doi: 10.3889/oamjms.2016.063.