1. Department of Cystic Fibrosis; “Aghia Sophia” Children's Hospital; Athens Greece
2. Pulmonology Unit; 1st Department of Pediatrics; Medical School; University of Athens; “Aghia Sophia” Children's Hospital; Athens Greece
3. Department of Microbiology; “Aghia Sophia” Children's Hospital; Athens Greece
4. Department of Critical Care; Medical School; University of Athens; University Hospital “Attikon”; Athens Greece