w1 Gibb WRG, Lees AJ. The relevance of the Lewy body to the pathogenesis of idiopathic Parkinson's disease. J Neurol Neurosurg Psychiatry 1988;51:745-52.
w2 Quinn N. Multiple system atrophythe nature of the beast. J Neurol Neurosurg Psychiatry 1989;(special supplement):78-89.
w3 Litvan I, Agid Y, Calne D, Campbell G, Dubois B, Duvoisin RC, et al. Clinical research criteria for the diagnosis of progressive supranuclear palsy (Steele-Richardson-Olszewski syndrome): report of the NINDS-SPSP international workshop. Neurology 1996;47:1-9.
w4 Smith P. Comparison between registries: age-standardized rates. In: Muir C, ed. Cancer incidence in five continents. Volume V. Lyons: IARC Scientific Publications, 1987;790-5. (No 88.)
w5 De Rijk MC, Tzourio C, Breteler MM, Dartigues JF, Amaducci L, Lopez-Pousa S, et al. Prevalence of parkinsonism and Parkinson's disease in Europe: the EUROPARKINSON collaborative study. European Community concerted action on the epidemiology of Parkinson's disease. J Neurol Neurosurg Psychiatry 1997;62:10-5.