1. Health Surveillance Department; Mutual Society of Castellón; Castellón Spain
2. Department of Medicine; Jaume I University; Castellón Spain
3. Internal Medicine Service; La Plana Hospital; Vila-real Spain
4. Department of Clinical Medicine; Miguel Hernández University; San Juan de Alicante Spain
5. Research Unit; Elda General Hospital; Elda Spain
6. Teaching Unit of Primary Health Care; Generalitat Valenciana; Castellón Spain
7. Health Centre of Benigánim; Generalitat Valenciana; Benigánim Spain