About the Authors

Leena Kovanen

leena.kovanen@thl.fi

Affiliation National Institute for Health and Welfare (THL), Department of Mental Health and Substance Abuse Services, Helsinki, Finland

Mari Kaunisto

Affiliations Institute for Molecular Medicine Finland (FIMM), University of Helsinki, Helsinki, Finland, Folkhälsan Institute of Genetics, Folkhälsan Research Center, Helsinki, Finland

Kati Donner

Affiliation Institute for Molecular Medicine Finland (FIMM), University of Helsinki, Helsinki, Finland

Sirkku T. Saarikoski

Affiliations Institute of Biomedicine, University of Helsinki, Helsinki, Finland, Ministry of Social Affairs and Health, Department of Occupational Safety and Health, Helsinki, Finland

Timo Partonen

Affiliation National Institute for Health and Welfare (THL), Department of Mental Health and Substance Abuse Services, Helsinki, Finland

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: TP MK LK. Performed the experiments: MK KD. Analyzed the data: MK LK. Wrote the paper: LK TP SS MK KD. Interpreted the genetic data: LK SS MK.