1. Geriatric and Rehabilitation Department, Golgi Redaelli Institute, Abbiategrasso, 26180 Milan, Italy
2. Medical & Surgical Emergency Department, “Carlo Poma” Hospital, 46100 Mantua, Italy
3. Department of Physical Medicine and Rehabilitation, University of Foggia, 71100 Foggia, Italy
4. Nuffield Department of Clinical Neurosciences, John Radcliffe Hospital, Level 6, West Wing, Oxford OX3 9DU, UK