1. Dermatology Department; Hospital Universitario Central de Asturias; 33006 Oviedo Asturias Spain
2. Unit of Psoriasis; Hospital Universitario Central de Asturias; 33006 Oviedo Asturias Spain
3. Rheumatology Department ; Hospital Universitario Central de Asturias; 33006 Oviedo Asturias Spain
4. Oficina de Investigación Biosanitaria de Asturias and Statistical Department; Oviedo University; 33006 Oviedo Asturias Spain
5. Molecular Genetics Department; Hospital Universitario Central de Asturias; 33006 Oviedo Asturias Spain