1. Department of Immunology, Hospital Universitario Central de Asturias, Celestino Villamil S/N, 33006 Oviedo, Spain
2. Department of Internal Medicine, Hospital Universitario Central de Asturias, Celestino Villamil S/N, 33006 Oviedo, Spain
3. Bone and Mineral Research Unit, Hospital Universitario Central de Asturias, Celestino Villamil S/N, 33006 Oviedo, Spain