1. Discipline of Pneumology, III-rd Medical Department, Faculty of Medicine, “Grigore T. Popa” University of Medicine and Pharmacy, 700115 Iași, Romania
2. Discipline of Hygiene, Department of Community Medicine, “Iuliu Hațieganu” University of Medicine and Pharmacy, 400012 Cluj, Romania
3. Unit of Non-Communicable Diseases, Department of Public Health, Institute of Tropical Medicine, 2000 Antwerp, Belgium
4. Discipline of Pneumology, Department of Medical Sciences, Faculty of Medicine, “Iuliu Hațieganu” University of Medicine and Pharmacy, 400012 Cluj, Romania