[1] Helsinki Univ Hosp, Dept Neurol, Helsinki, Finland
[2] Univ Helsinki, Dept Clin Neurosci, Helsinki, Finland
[3] Helsinki Sleep Clin, Terveystalo Healthcare, Helsinki, Finland
[4] Social Insurance Inst Finland KELA, Dept Neurol, Helsinki, Finland
[5] Univ Gdansk, Dept Emergency Med, Gdansk, Poland
[6] Helsinki Univ Cent Hosp, Psychiat Ctr, Helsinki, Finland
[7] Finnish Inst Occupat Hlth, Helsinki, Finland