Response to a Letter to the Editor

Affiliations

• ¹ Finnish Institute for Health and Welfare; Department of Psychiatry, University of Helsinki and Helsinki University Hospital; SleepWell Research Program, Faculty of Medicine, University of Helsinki and Helsinki University Hospital. Electronic address: erik.cederlof@helsinki.fi.
• ² Finnish Institute for Health and Welfare; Department of Psychiatry, University of Helsinki and Helsinki University Hospital; SleepWell Research Program, Faculty of Medicine, University of Helsinki and Helsinki University Hospital.