1. University of Medicine and Pharmacy “Carol Davila” , Clinical Department 2 , Bucharest , Romania
2. Faculty of Medicine , “Ovidius” University of Constanța , 4th Department of Clinical Diseases , Romania
3. Clinical Pneumophthisiology Hospital , Constanța , Romania
4. St Andrew Clinical County Emergency Hospital , Constanța , Romania
5. Clinical Hospital Colentina, Clinic for Occupational Diseases , Bucharest , Romania