1. Department of Physiotherapy, Faculty of Sport Sciences, Universidad Europea of Madrid, Villaviciosa de Odón, 28670 Madrid, Spain
2. Doctoral Program in Healthcare, Faculty of Nursing, Physiotherapy and Podiatry. University Complutense of Madrid, 28040 Madrid, Spain
3. Department of Radiology, Rehabilitation and Physiotherapy, Faculty of Nursing, Physiotherapy and Podiatry, Universidad Complutense de Madrid, 28040 Madrid, Spain
4. Hospital Infantil Universitario Niño Jesús, 28009 Madrid, Spain
5. Spinal Unit, Department of Orthopedic Surgery and Traumatology, Hospital Infantil Universitario Niño Jesús, 28009 Madrid, Spain
6. InPhysio Research Group, Instituto de Investigación Sanitaria del Hospital Clínico San Carlos (IdISSC), 28040 Madrid, Spain