[1] Golgi Redaelli Inst, Geriatr & Rehabil Dept, I-26180 Milan, Italy
[2] Carlo Poma Hosp, Med & Surg Emergency Dept, I-46100 Mantua, Italy
[3] Univ Foggia, Dept Phys Med & Rehabil, I-71100 Foggia, Italy
[4] John Radcliffe Hosp, Nuffield Dept Clin Neurosci, Level 6,West Wing, Oxford OX3 9DU, England