[1] Univ Gothenburg, Sahlgrenska Acad, Dept Internal Med & Clin Nutr, Ctr Sleep & Wake Disorders, Gothenburg, Sweden
[2] Univ Crete, Sch Med, Dept Resp Med, Sleep Disorders Ctr, Iraklion, NE, Greece
[3] Turku Univ Hosp, Dept Pulm Dis, Turku, Finland
[4] Univ Turku, Dept Pulm Dis, Sleep Res Ctr, Dept Pulm Dis & Clin Allergol, Turku, Finland
[5] G Papanikolaou Hosp, Resp Failure Unit, Thessaloniki, Greece
[6] Antwerp Univ Hosp, Multidisciplinary Sleep Disorders Ctr, Antwerp, Belgium
[7] Univ Antwerp, Antwerp, Belgium
[8] Ist Auxol Italiano IRCCS, San Luca Hosp, Sleep Disorders Ctr, Milan, Italy
[9] Sleep Disorders Ctr, Reinbek, Germany
[10] Safarik Univ, Dept Resp Med & TB, Fac Med, Kosice, Slovakia
[11] L Pasteur Univ Hosp, Kosice, Slovakia
[12] Univ Hosp Brno, Dept Cardiol, Brno, Czech Republic
[13] St Anns Univ Hosp, Int Clin Res Ctr, Brno, Czech Republic
[14] Univ Palermo, PROMISE Dept, Palermo, Italy
[15] Univ Coll Dublin, St Vincents Hosp Grp, Dept Resp & Sleep Med, Dublin, Ireland
[16] Ege Univ, Dept Chest Dis, Izmir, Turkey
[17] Univ Gothenburg, Sahlgrenska Acad, Dept Internal Med & Clin Nutr, Ctr Sleep & Wake Disorders, Gothenburg, Sweden