1 Department of Physical Therapy, Occupational Therapy, Physical Medicine and Rehabilitation, Facultad de Ciencias de la Salud, Universidad Rey Juan Carlos (URJC), Avenida de Atenas s/n, Alcorcón, Madrid 28922, Spain. Electronic address: cesar.fernandez@urjc.es.
2 Department of Electronic Engineering, Intelligent Data Analysis Laboratory, ETSE (Engineering School), Universitat de València (UV), Valencia, Spain.
3 Department of Physical Therapy, Occupational Therapy, Physical Medicine and Rehabilitation, Facultad de Ciencias de la Salud, Universidad Rey Juan Carlos (URJC), Avenida de Atenas s/n, Alcorcón, Madrid 28922, Spain.
4 Department of Developmental and Educational Psychology, Universitat de València (UV), València, Spain.