1. Faculty of Nursing; University of Navarre; Pamplona Navarre Spain
2. Faculty of Law and Social Sciences; University of La Rioja; Logroño La Rioja Spain
3. Department of Neurology; Clínica Universidad de Navarra; Pamplona Navarre Spain
4. Navarre Association of Parkinson's patients; Pamplona Navarre Spain
5. San Juan Primary Health Centre; Navarre Service of Health-Osasunbidea; Pamplona Navarre Spain
6. NIHR CLAHRC WESSEX; Faculty of Health Sciences; University of Southampton; Southampton Hampshire UK