1. Internal Medicine Department, Hospital Universitario Central de Asturias From the , Oviedo, Asturias, Spain
2. Internal Medicine Department, Hospital Valle del Nalón , Langreo, Asturias, Spain
3. Otorhinolaryngology Department, Hospital Universitario Central de Asturias , Oviedo, Asturias, Spain
4. Radiology Department, Hospital Universitario Central de Asturias , Oviedo, Asturias, Spain
5. Neurology Department, Hospital Universitario Central de Asturias , Oviedo, Asturias, Spain
6. Internal Medicine Department, Hospital Carmen y Severo Ochoa , Cangas de Narcea, Asturias, Spain
7. Internal Medicine Department, Instituto de Investigación Sanitaria del Principado de Asturias (ISPA), Hospital Universitario Central de Asturias , Oviedo, Asturias, Spain