1. The Observatory of Pain, University of Cadiz, Cadiz, Spain
2. Biomedical Research and Innovation Institute of Cadiz (INiBICA), Research Unit, Puerta Del Mar University Hospital, University of Cadiz, Cadiz, Spain
3. Preventive Medicine and Public Health Area, University of Cadiz, Cadiz, Spain
4. Department of Statistics and Operational Research, University of Cadiz, Puerto Real, Spain
5. Department of Nursing and Physiotherapy, University of Cadiz, Cadiz, Spain