The metric properties of a novel non-motor symptoms scale for parkinson's disease : Results from an international pilot studyRAY CHAUDHURI, Kallol; MARTINEZ-MARTIN, Pablo; BARONE, Paolo et al.Movement disorders. 2007, Vol 22, Num 13, pp 1901-1911, issn 0885-3185, 11 p.Article

Prevalence of nonmotor symptoms in parkinson's disease in an international setting; Study using nonmotor symptoms questionnaire in 545 patientsMARTINEZ-MARTIN, Pablo; SCHAPIRA, Anthony H. V; TSUBOI, Yoshio et al.Movement disorders. 2007, Vol 22, Num 11, pp 1623-1629, issn 0885-3185, 7 p.Article