[1] Natl & Kapodistrian Univ Athens, Sch Med, Dept Paediat 1, Paediat Pulmonol Unit, Athens, Greece
[2] Aghia Sophia Childrens Hosp, Athens 11527, Greece
[3] Univ Hosp Burgos, Multidisciplinary Sleep Unit, Pulmonol, Burgos, Spain
[4] Burgos Fdn Hlth Res, CIBER Resp Dis CIBERES, Burgos, Spain
[5] Univ Antwerp, Univ Antwerp Hosp, Dept Otorhinolaryngol Head & Neck Surg, Antwerp, Belgium
[6] Great Ormond St Hosp Sick Children, Dept Resp Med, London, England
[7] Univ Thessaly, Sch Med, Sleep Disorders Lab, Larisa, Greece
[8] Larissa Univ Hosp, Larisa, Greece
[9] Marmara Univ, Div Paediat Pulmonol, Istanbul, Turkey
[10] Sophia Childrens Univ Hosp, Erasmus MC, Paediat Intens Care, Rotterdam, Netherlands
[11] Univ Autonoma Barcelona, Corporacio Sanitaria Parc Tauli, Dept Paediat, Paediat Pulmonol Unit, Barcelona, Spain
[12] Civ Hosp Lugano, Neuroctr Southern Switzerland, Sleep & Epilepsy Ctr, Lugano, Switzerland
[13] Univ Toronto, Hosp Sick Children, Div Resp Med, Toronto, ON, Canada
[14] Royal Brompton Hosp, Dept Paediat Resp Med, London, England
[15] Paris Diderot Univ, Robert Debre Univ Hosp, Paediat Sleep Ctr, EA REMES 7334, Paris, France
[16] Kempenhaeghe Fdn, Sleep Med Ctr, Heeze, Netherlands
[17] Sapienza Univ Rome, S Andrea Hosp, Sch Med & Psychol, Paediat Sleep Dis Ctr,Child Neurol,NESMOS Dept, Rome, Italy
[18] Maastricht Univ, Med Ctr, Dept Paediat, Paediat Intens Care Unit, Maastricht, Netherlands
[19] Sao Paulo State Univ, UNESP, Botucatu Med Sch, Dept Ophthalmol Otolaryngol & Head & Neck Surg, Botucatu, SP, Brazil
[20] Univ Antwerp Hosp, Dept Paediat, Edegem, Belgium