Parkinsons DiseaseLancet 373:2055-2066, Lees,A.J.,et al, 2009
Parkinson's DiseaseLancet 363:1783-1793, Samii,A.,et al, 2004
A 60-Year-Old Man with Parkinson's DiseaseJAMA 275:716-722, Olanow,C.W., 1996