1. Division of Epidemiology, Department of Family Medicine and Population Health, School of Medicine, Virginia Commonwealth University, Richmond, Virgina, USA
2. School of Nursing, Duke University, Durham, North Carolina, USA
3. Department of Physical Medicine and Rehabilitation, Oslo University Hospital, Oslo, Norway
4. Institute of Clinical Medicine, Faculty of Medicine, University of Oslo, Oslo, Norway
5. Institute of Health and Society, Research Centre for Habilitation and Rehabilitation Models and Services (CHARM), Faculty of Medicine, University of Oslo, Oslo, Norway
6. Center for Rehabilitation Science and Engineering (CERSE) Department of Physical Medicine and Rehabilitation, School of Medicine, Virginia Commonwealth University, Richmond, Virgina, USA