1. L. Fernandes, PT, MSc, is a PhD student, Norwegian Research Center for Active Rehabilitation (NAR), Orthopedic Centre, Oslo University Hospital, Ullevaal and Hjelp24NIMI, Oslo, Norway. Mailing address: FoU, Ortopedisk Senter, Bevegelsesdivisjonen Bygg 73, 2, Ullevål Sykehus Kirkeveien 166, 0407 Oslo, Norway.
2. K. Storheim, PT, PhD, is Senior Researcher, Norwegian Research Center for Active Rehabilitation (NAR), Orthopedic Centre, Oslo University Hospital, Ullevaal and Hjelp24NIMI.
3. L. Nordsletten, MD, PhD, is Professor, Orthopedic Center, Oslo University Hospital, Ullevaal.
4. M.A. Risberg, PT, PhD, is Associate Professor, Norwegian Research Center for Active Rehabilitation (NAR), Orthopedic Centre, Oslo University Hospital, Ullevaal and Hjelp24NIMI, and Norwegian School of Sport Sciences, Oslo, Norway.