1 Centro Superior de Estudios Universitario La Salle, Madrid, Spain; Hospital Universitario La Paz (IdiPAZ), Unidad de Fisioterapia, Madrid, Spain. Electronic address: alfonso.gil@lasallecampus.es.
2 Department of Physical Therapy, Occupational Therapy, Rehabilitation and Physical Medicine, Rey Juan Carlos University, Madrid, Spain.
3 University of Applied Sciences, Faculty of Business and Social Sciences, Osnabrück, Germany; Faculties of Rehabilitation Medicine and Medicine and Dentistry, Edmonton, Alberta, Canada.