1. Health Services Management of Lanzarote's Health Area Arrecife Spain
2. Health Promotion Service General Directorate of Public Health of the Canary Islands Health Service Santa Cruz de Tenerife Spain
3. Department of Dental Clinical Specialties, Faculty of Dentistry Complutense University of Madrid Madrid Spain
4. Department of Preclinical Dentistry Biomedical Sciences and Health Sciences Faculty European University of Madrid Madrid Spain