1. Clinical Center of Serbia, Clinic for Pulmonology, Belgrade, Serbia + University of Belgrade, Faculty of Medicine, Belgrade, Serbia
2. Clinical Center of Serbia, Clinic for Pulmonology, Belgrade, Serbia
3. University of Belgrade, Faculty of Pharmacy, Department for Molecular Biochemistry, Belgrade, Serbia
4. University of Novi Sad, Faculty of Medicine, Novi Sad, Serbia + Institute for Pulmonary Diseases of Vojvodina, Sremska Kamenica, Serbia
5. Institute for Students Health Care, Belgrade, Serbia
6. GlaxoSmithKline, Medical Department, Belgrade, Serbia