1 Department of Internal Medicine, Hospital Universitario Central de Asturias, Oviedo, Spain.
2 Department of Oncology, Hospital Universitario Central de Asturias, Oviedo, Spain.
3 Department of Internal Medicine, Hospital Universitario San Agustín, Avilés, Spain.
4 Systemic Autoinmune Disease Unit, Department of Internal Medicine, Instituto de Investigación Sanitaria del Principado de Asturias (ISPA), Hospital Universitario Central de Asturias, Oviedo, Spain.