1. Department of Health Sciences and Technology, Institute of Human Movement Sciences and Sport, ETH Zurich, Zurich, Switzerland.
2. Department of Computer Science, University of Milan, Milan, Italy.
3. Department of Epidemiology, CAPHRI School for Public Health and Primary Care, Maastricht University, Maastricht, The Netherlands.
4. Centre for Evidence Based Physiotherapy, Maastricht University, Maastricht, The Netherlands.