1. Swiss Paraplegic Research; Nottwil Switzerland
2. Department of Sports Medicine and Sports Nutrition; University of Bochum; Bochum Germany
3. Gerontology Research Center and Department of Health Sciences; University of Jyväskylä; Jyväskylä Finland
4. School of Business; Aalto University; Helsinki Finland
5. Finnish Institute of Occupational Health; Helsinki Finland
6. Gerontology Research Center and School of Health Sciences; University of Tampere; Tampere Finland
7. Juhani Ilmarinen Consulting; Vantaa Finland