1. Biomedical Research and Innovation Institute of Cádiz (INiBICA), Cádiz, Spain;
2. The Observatory of Pain Department, University of Cádiz, Cádiz, Spain;
3. Department of Statistics and Operational Research, University of Cádiz, Cádiz, Spain;
4. Department of Mathematics, University of Cádiz, Cádiz, Spain;
5. Preventive Medicine and Public Health Area, University of Cádiz, Cádiz, Spain;
6. Department of Nursing and Physiotherapy, University of Cádiz, Cádiz, Spain