1. Department Clinical and Experimental Medicine, Geriatric Endocrine Unit; University Hospital of Parma; Parma Italy
2. Geriatric Unit; University Hospital of Parma; Parma Italy
3. Geriatric Unit; Azienda Sanitaria di Firenze Toscana; Florence Italy
4. Laboratory of Epidemiology, Demography, and Biometry; National Institute on Aging; Baltimore Maryland
5. National Institute on Aging; Baltimore Maryland