Corresponding author:
Prof. Hubert BLAIN, Department of Geriatrics, Montpellier University Hospital, Montpellier University, France. Full postal address: Centre Antonin Balmes, Pôle de Gérontologie du Centre Hospitalier Universitaire de Montpellier , 39 avenue Charles Flahault, 34295 Montpellier Cedex 5, France. e-mail: h-blain@chu-montpellier.fr; tel: +33 467339957 Fax: +33 467330948