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Nocera JR, Stegemöller EL, Malaty IA, Okun MS, Marsiske M, Hass CJ; National Parkinson Foundation Quality Improvement Initiative Investigators.Nocera JR, et al.Arch Phys Med Rehabil. 2013 Jul;94(7):1300-5. doi: 10.1016/j.apmr.2013.02.020. Epub 2013 Mar 6.Arch Phys Med Rehabil. 2013.PMID: 23473700Free PMC article.