1. International School of Osteopathy, Bilbao, Spain.
2. Department of Health Sciences, Public University of Navarra, Navarra, Spain.
3. Clinical Research Department, TDN, Orthopaedic Surgery and Advanced Rehabilitation Centre, Pamplona, Spain.
4. National Research Centre for the Working Environment, Copenhagen, Denmark.
5. Physical Activity and Human Performance Group, SMI, Department of Health Science and Technology, Aalborg University, Aalborg, Denmark.
6. Centre for Studies on Measurement of Physical Activity, School of Medicine and Health Sciences, Universidad del Rosario, Bogotá, Colombia.
7. University of Deusto, Bilbao, Spain.