About the Authors

Peter Knaster

peter.knaster@dr.com

Affiliation Department of Psychiatry, Helsinki University Central Hospital, Helsinki, Finland

Ann-Mari Estlander

Affiliation Pain Clinic, Helsinki University Central Hospital, Helsinki, Finland

Hasse Karlsson

Affiliation Department of Psychiatry, Helsinki University Central Hospital, Helsinki, Finland

Jaakko Kaprio

Affiliation Hjelt Institute, Department of Public Health, University of Helsinki, Helsinki, Finland

Eija Kalso

Affiliation Pain Clinic, Helsinki University Central Hospital, Helsinki, Finland

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: EK AME JK PK HK. Performed the experiments: PK. Analyzed the data: PK JK. Contributed reagents/materials/analysis tools: EK AME PK. Wrote the paper: PK.