1. Department of Sustainable Productivity, TNO, P.O. Box 718, 2130 AS Hoofddorp, The Netherlands
2. Department of Life Style, TNO, P.O. Box 2215, 2301 CE Leiden, The Netherlands
3. Department of Medical Decision Making, Leiden University Medical Centre, P.O. Box 9600, 2300 RC Leiden, The Netherlands
4. Pieter van Foreest-De Bieslandhof, Nursing Home and Rehabilitation Centre, Beukenlaan 2, 2612 VC Delft, The Netherlands
5. Laurens-Antonius Binnenweg, Nursing Home and Rehabilitation Centre, Nieuwe Binnenweg 33, 3014 GC Rotterdam, The Netherlands
6. Department of Technical Sciences, TNO, P.O. Box 155, 2600 AD Delft, The Netherlands
7. Department of Public Health and Primary Care, Leiden University Medical Centre, P.O. Box 9600, 2300 RC Leiden, The Netherlands