[1] Univ Crete, Sleep Disorders Ctr, Iraklion, Greece
[2] Aristotle Univ Thessaloniki, Med Sch, G Papanikolaou Hosp, Dept Resp Med,Resp Failure Unit, Thessaloniki, Greece
[3] Democritus Univ Thrace, Dept Pneumonol, Alexandroupolis, Greece
[4] Sahlgrens Univ Hosp, Sleep Lab, Pulm Med, Gothenburg, Sweden
[5] Univ Palermo, DiBiMIS, Palermo, Italy
[6] Marrone Ibim Cnr It, Palermo, Italy
[7] Ege Univ, Fac Med, Dept Chest Dis, Izmir, Turkey
[8] Antwerp Univ Hosp, Antwerp, Belgium
[9] Univ Antwerp, Antwerp, Belgium
[10] IRCCS Ist Auxol Italiano, San Luca Hosp, Sleep Disorders Ctr, Milan, Italy
[11] Univ Split, Sch Med, Dept Neurosci, Soltanska, Split, Croatia
[12] Univ Split, Sch Med, Split Sleep Med Ctr, Soltanska, Split, Croatia
[13] Univ Crete, Leep Disorders Ctr, Iraklion, Greece