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Motor function in Parkinson's disease and supranuclear palsy: simultaneous factor analysis of a clinical scale in several populations

Pieter M Kroonenberg*, Frans J Oort, Glenn T Stebbins, Sue E Leurgans, Esther Cubo and Christopher G Goetz

BMC Medical Research Methodology 2006, 6:26 doi:10.1186/1471-2288-6-26

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