1. Multidisciplinary Pain Management Unit, Hospital Universitari i Politècnic La Fe, Av. de Fernando Abril Martorell , 106, 46026 Valencia , Spain
2. Anaesthesiology Department, Hospital Universitari i Politècnic La Fe, Av. de Fernando Abril Martorell , 106, 46026 Valencia , Spain
3. Psychiatry Department, Hospital Universitari i Politècnic La Fe, Av. de Fernando Abril Martorell , 106, 46026 Valencia , Spain
4. Multidisciplinary Pain Management Unit, Hospital Universitario Quirónsalud, Calle Diego de Velázquez , 1, 28223 Pozuelo de Alarcón , Madrid , Spain
5. Surgical Specialities Department, Hospital Universitari i Politècnic La Fe, Av. de Fernando Abril Martorell , 106, 46026 Valencia , Spain
6. Unit of Preventive Medicine and Public Health, Department of Preventive Medicine and Public Health, Food Sciencs, Toxicology and Forensic Medicine, Universitat de València, Av. Vicent Andrés Estellés s/n , 46100 Burjassot , Valencia , Spain
7. CIBER Epidemiology and Public Health (CIBERESP), The Institute of Health Carlos III (ISCIII), Av. Monforte de Lemos , 3-5, Pabellón 11, Planta 0, 28029 Madrid , Spain