1. Michalinio Pediatric Development Centre, Ministry of Employment, Athens, Greece
2. Respiratory Unit, Department of Pediatrics, Academic General Hospital of Alexandroupolis, Dragana, Alexandroupolis, Thrace, Greece
3. Department of Electrical and Computer Engineering, Democritus University of Thrace, Xanthi, Greece
4. Department of Statistics and Actuarial-Financial Mathematics, University of the Aegean, Samos, Greece
5. Respiratory Department, General Hospital of Athens “ELPIS,” Athens, Greece