1. Pediatric Cardiosurgical Intensive Care Unit; “Onassis” Cardiac Surgery Center; Athens Greece
2. Faculty of Nursing; National & Kapodistrian University of Athens; Athens Greece
3. Department of Allergy-Pneumonology; Penteli Children's Hospital; Athens Greece
4. Third Department of Pediatrics, Attikon Hospital, Medical School; University of Athens; Athens Greece
5. Paediatric Respiratory Unit; 3rd University Paediatric Clinic; Hippokrateion General Hospital of Thessaloniki; Thessaloníki Greece