Pejkovska, S.; Jovkovska Kaeva, B.; Goseva, Z.; Arsovski, Z.; Jovanovska Janeva, J.; Zeynel, S. Predictive Factors for the Effect of Treatment by Noninvasive Ventilation in Patients With Respiratory Failure As a Result of Acute Exacerbation of the Chronic Obstructive Pulmonary Disease. Open Access Maced J Med Sci 2015, 3, 655-660.