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This article contains supplementary material available online at http://www.interscience.wiley/com/jpages/0885-3185/suppmat

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jws-mds.21537.tbl1A.doc63KTable A: Results of observational studies on the course of disability and its prognostic factors in patients with Parkinson?s disease
jws-mds.21537.apx1A.doc26KAppendix A: Specification of criteria list systematic review of the progression of PD and its prognostic factors
jws-mds.21537.apx1B.doc26KAppendix B: Levels of evidence that were applied in the qualitative data analysis

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