[1
]
Finnish Institute of Occupational Health, Helsinki, Finland; Department of Public
Health, University of Helsinki, Helsinki, Finland. Electronic address: christer.hublin@ttl.fi.
[2
]
Institute for Molecular Medicine Finland, University of Helsinki, Helsinki, Finland.
[3
]
Department of Public Health, University of Helsinki, Helsinki, Finland; Helsinki Sleep
Clinic, Vitalmed Research Centre, Helsinki, Finland.
[4
]
Department of Public Health, University of Helsinki, Helsinki, Finland.
[5
]
Department of Public Health, University of Helsinki, Helsinki, Finland; Institute
for Molecular Medicine Finland, University of Helsinki, Helsinki, Finland; National
Institute for Health and Welfare, Helsinki, Finland.