1. S. Dahlin Ivanoff, OTR, PhD, is Assistant Professor, Department of Ophthalmology and Department of Geriatric Medicine, Institute of Occupational Therapy and Physiotherapy, Göteborg University, Göteborg, Sweden; sydi@fhs.gu.se
2. U. Sonn, OTR, PhD, is Associate Professor, Department of Geriatric Medicine, Institute of Occupational Therapy and Physiotherapy, Göteborg University, Göteborg, Sweden
3. E. Svensson, Biostatistician, PhD, is Professor and Biostatistician, Department of Statistics, Örebro University, Sweden