About the Authors

Pekka Kuittinen

pekkaku@student.uef.fi

Affiliation Department of Neurosurgery, Kuopio University Hospital, Kuopio, Finland and Institute of Clinical Medicine, University of Eastern Finland, Kuopio, Finland

Petri Sipola

Affiliation Department of Clinical Radiology, Kuopio University Hospital, Kuopio, Finland and Unit of Radiology, Institute of Clinical Medicine, University of Eastern Finland, Kuopio, Finland

Ville Leinonen

Affiliation Department of Neurosurgery, Kuopio University Hospital, Kuopio, Finland and Unit of Neurosurgery, Institute of Clinical Medicine, University of Eastern Finland, Kuopio, Finland

Tapani Saari

Affiliation Department of Clinical Radiology, Kuopio University Hospital, Kuopio, Finland

Sanna Sinikallio

Affiliation Institute of Public Health and Clinical Nutrition, University of Eastern Finland, Kuopio, Finland

Sakari Savolainen

Affiliation Department of Neurosurgery, Kuopio University Hospital, Kuopio, Finland

Heikki Kröger

Affiliation Department of Orthopaedics and Traumatology, Kuopio University Hospital and Bone and Cartilage Research Unit, University of Eastern Finland, Kuopio, Finland

Veli Turunen

Affiliation Department of Orthopaedics and Traumatology, Kuopio University Hospital, Kuopio, Finland

Olavi Airaksinen

Affiliation Department of Physical and Rehabilitation Medicine, Kuopio University Hospital, Kuopio, Finland

Timo Aalto

Affiliation Health Center Ikioma OY, Mikkeli, Finland

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: PK TJA PS VL OA HK VT S. Sinikallio TS S. Savolainen. Performed the experiments: PK TJA PS VL OA HK VT S. Sinikallio TS S. Savolainen. Analyzed the data: PK TJA PS VL. Contributed reagents/materials/analysis tools: PK TJA PS VL OA HK VT S. Sinikallio TS S. Savolainen. Wrote the paper: PK TJA PS VL.