3Benito Leon J, Bermejo Pareja F, Morales-Gonzdlez JM, et al. Incidence of Parkinson disease and parkinsonism in three elderly populations of central Spain. Neurology, 2004,62 : 734-741.
4Thanvi B, Lo N, Robinson T. Vascular parkinsonism-an important cause of parkinsonism in older people. Age Ageing, 2005,34: 114-119.
5Demirkiran M, Bozdemir H, Sarica Y. Vascular parkinsonism: a distinct, heterogeneous clinical entity. Acta Neurol Scand, 2001,104:63-67.
6Benito-Leon J, Bermejo-Pareja F, Rodriguez J, et al. Prevalence of PD and other types of parkinsonism in three elderly populations of central Spain. Mov Disord, 200a, 18 : 267-274.
7[1]Poewe WH, Wenning GK. The natural history of Parkinson′s disease. Ann Neurol, 1998, 44(Suppl 1): S1-S9
8[2]Calne DB, Snow BJ, Lee C. Criteria for diagnosing Parkinson′s disease. Ann Neurol, 1992, 32 Suppl: S125-127
9[3]Fahr S. Parkinsonism. In: Rowland LP ed. Meritt′s Textbook of Neurology. 9th ed. Baltimore: Williams & Wilkins Rose Tree Corporate Center, 1995. 713-730
