1. Physical Therapy and Health Sciences Research Group, Faculty of Sport Sciences, Department of Physiotherapy, Chiropody and Dance, Universidad Europea de Madrid, 28670 Madrid, Spain
2. International Doctorate School, Rey Juan Carlos University, 28008 Madrid, Spain
3. Department of Physical Therapy, Occupational Therapy, Physical Medicine and Rehabilitation, Research Group of Humanities and Qualitative Research in Health Science, Rey Juan Carlos University, 28922 Alcorcón, Spain
4. Pediatric Palliative Care Unit, Hospital Universitario Infantil Niño Jesús, 28009 Madrid, Spain