1. CNR-IFC Clinical Epidemiology of Renal Diseases and Hypertension; Reggio Cal c/o Ospedali Riuniti; Reggio Cal Italy
2. Nephrology, Transplantation and Hypertension Division; Ospedali Riuniti; Reggio Cal Italy
3. Bone and Mineral Research Unit; Reina Sofia Research Institute of the Hospital; Universitario Central de Asturias
4. Department of Medicine; University of Oviedo; Oviedo Spain