1. Department of Otorhinolaryngology; Head and Neck Surgery; Antwerp University Hospital; University of Antwerp; Belgium
2. Department of Paediatric Respiratory and Sleep Medicine; Great Ormond Street Hospital for Children; London United Kingdom
3. Sleep Disorders Laboratory; University of Thessaly School of Medicine and Larissa University Hospital; Larissa Greece
4. University of Rome “La Sapienza“ School of Medicine; Rome Italy
5. Regional Sleep Disorders Center, Sant’ Andrea Hospital; Rome Italy
6. First Department of Paediatrics; Pediatric Pulmonology Unit; University of Athens School of Medicine and Aghia Sophia Children's Hospital; Athens Greece
7. Sleep and Epilepsy Center; Neurocenter of the Southern Switzerland; Civic Hospital of Lugano; Lugano Switzerland
8. Department of Pediatric Pulmonology; Antwerp University Hospital; University of Antwerp; Belgium