TABLE 1.

Participating sleep centres.

Sleep centre	Participating scorers
Charite–Universitaetsmedizin Berlin, Berlin, Germany	2
Istituti Clinici Scientifici Maugeri Spa Società Benefit, Pavia, Italy	1
Princess Alexandra Hospital, Brisbane, Australia	1
Reykjavik University, Reykjavik, Iceland	2
Turku University Central Hospital, Turku, Finland	1
University of Gothenburg, Gothenburg, Sweden	1
University of Lisbon, Lisbon, Portugal	2