1. Department of Medical Biochemistry, Faculty of Pharmacy, University of Belgrade, Belgrade, Serbia.
2. Institute of Molecular Genetics and Genetic Engineering, University of Belgrade, Belgrade, Serbia.
3. Department of Pulmonology, Zvezdara University Medical Centre, Belgrade, Serbia.
4. Department of Internal Medicine, School of Dentistry, University of Belgrade, Belgrade, Serbia.
5. Clinic for Pulmonary Diseases Clinical Centre of Serbia, School of Medicine, University of Belgrade, Belgrade, Serbia.