Pertseva, T.O., Konopkina, L.I., Veresa, O.V. and Huba, Y.V. 2016. The level of anxiety in patients with chronic obstructive pulmonary disease: diagnosis, differential diagnosis and treatment approaches. Zaporozhye Medical Journal. 18, 2 (May 2016). DOI:https://doi.org/10.14739/2310-1210.2016.2.69218.