“COVID-19 Morbidity and Its Influence on Death Rate in Patients With Pulmonary Arterial and Chronic Thromboembolic Pulmonary Hypertension”. Ukrainian Journal of Cardiology, vol. 30, no. 3-4, Sept. 2023, pp. 29-37, https://doi.org/10.31928/2664-4479-2023.3-4.2937.