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Hohler AD, Amariei DE, Katz DI, DePiero TJ, Allen VB, Boyle S, Phenix HA, DeAngelis TA, Geibel CD, Smith KM, Saint-Hilaire M, Ellis T.Hohler AD, et al. Among authors: katz di.J Parkinsons Dis. 2012;2(3):235-40. doi: 10.3233/JPD-2012-012101.J Parkinsons Dis. 2012.PMID: 23938231
Katz DI, Alexander MP, Klein RB.Katz DI, et al.Arch Phys Med Rehabil. 1998 May;79(5):488-93. doi: 10.1016/s0003-9993(98)90060-0.Arch Phys Med Rehabil. 1998.PMID: 9596386