1. Department of Pulmonology and Allergology, State University of Medicine and Pharmacy “Nicolae Testemitanu”, Chisinau, Moldova
2. Outpatient Department, Institute of Phtisiopneumology “Chiril Draganiuc”, Chisinau, Moldova
3. Department of Respiratory Medicine, Laboratory of Molecular and Cellular Pulmonology, School of Medicine, University of Crete, Heraklion, Greece