Katrine Halsen, MSc, Physiotherapist, Department of Rehabilitation Science and Health Technology, Faculty of Health Sciences, Oslo Metropolitan University, Oslo, Norway.

Odd Einar Svinøy, MSc, PhD candidate, Department of Rehabilitation Science and Health Technology, Faculty of Health Sciences, Oslo Metropolitan University, Oslo, Norway.

Gunvor Hilde, PhD, Associate Professor, Department of Rehabilitation Science and Health Technology, Faculty of Health Sciences, Oslo Metropolitan University, Oslo, Norway.

Birgitta Langhammer, PhD, Professor, Department of Rehabilitation Science and Health Technology, Faculty of Health Sciences, Oslo Metropolitan University, Oslo, Norway.

Correspondence: Birgitta Langhammer, PhD, Department of Rehabilitation Science and Health Technology, Faculty of Health Sciences, Oslo Metropolitan University, Oslo 0130, Norway ([email protected]).

No potential conflict of interest was reported by the authors.