1. Humana Sähäkkä Ltd., Ylivieska, Finland
2. Research Unit of Population Health, University of Oulu, Oulu, Finland
3. Medical Research Center Oulu, Oulu University Hospital and University of Oulu, Oulu, Finland
4. Department of Psychiatry, Oulu University Hospital, Oulu, Finland
5. Oulu University of Applied Sciences, Oulu, Finland