1. “George D. Behrakis Research Lab” Hellenic Cancer Society; Athens Greece
2. Biomedical Research Foundation; Academy of Athens; Athens Greece
3. Institute of Public Health; The American College of Greece; Athens Greece
4. Department of Hygiene, Epidemiology and Medical Statistics; National and Kapodistrian University of Athens, Medical School; Athens Greece
5. Respiratory Function Laboratory, 1st Respiratory Medicine Department, Sotiria General Hospital; National and Kapodistrian University of Athens, Medical School; Athens Greece