Affiliation: | 1. Department of Pneumonology, School of Medicine in Katowice, Medical University of Silesia, Katowice, Poland;2. Department of Physiotherapy, Opole Medical School, Opole, Poland;4. Department of Epidemiology, School of Medicine in Katowice, Medical University of Silesia, Katowice, Poland;5. Division of Respiratory, Critical Care and Sleep Medicine, University of Saskatchewan, Saskatoon, Saskatchewan, Canada;6. Division of Angiology, Wroclaw Medical University, Wroclaw, Poland |