1. Emergency Department, Hospital Ramón y Cajal, Madrid, Spain
2. Rehabilitation Department, Hospital 12 de Octubre, Madrid, Spain
3. Malpartida, Primary Healthcare Centre, Cáceres, Spain
4. Pain Unit, Hospital de Alicante, Alicante, Spain
5. Daroca Primary Healthcare Centre, Madrid, Spain
6. Traumatology Department, Hospital La Fe, Valencia, Spain
7. Medical Department, Grünenthal Pharma, S.A, Madrid, Spain