About the Authors

Peter Knaster

Contributed equally to this work with: Peter Knaster, Ann-Mari Estlander, Hasse Karlsson, Jaakko Kaprio, Eija Kalso

peter.knaster@dr.com

Affiliation Pain Clinic, Department of Anaesthesiology, Intensive Care and Pain Medicine, Helsinki University Hospital and University of Helsinki, Helsinki, Finland

Ann-Mari Estlander

Contributed equally to this work with: Peter Knaster, Ann-Mari Estlander, Hasse Karlsson, Jaakko Kaprio, Eija Kalso

Affiliation Pain Clinic, Department of Anaesthesiology, Intensive Care and Pain Medicine, Helsinki University Hospital and University of Helsinki, Helsinki, Finland

Hasse Karlsson

Contributed equally to this work with: Peter Knaster, Ann-Mari Estlander, Hasse Karlsson, Jaakko Kaprio, Eija Kalso

Affiliation Department of Clinical Science, University of Turku, Turku, Finland

Jaakko Kaprio

Contributed equally to this work with: Peter Knaster, Ann-Mari Estlander, Hasse Karlsson, Jaakko Kaprio, Eija Kalso

Affiliation Faculty of Medicine and Institute for Molecular Medicine, University of Helsinki, Helsinki, Finland

Eija Kalso

Contributed equally to this work with: Peter Knaster, Ann-Mari Estlander, Hasse Karlsson, Jaakko Kaprio, Eija Kalso

Affiliation Pain Clinic, Department of Anaesthesiology, Intensive Care and Pain Medicine, Helsinki University Hospital and University of Helsinki, Helsinki, Finland

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

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