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                                    Maximal Speed Gait Initiation of Healthy Elderly Individuals and Persons With Parkinson Disease  
                                
                                
                                Leland E. Dibble PhD, PT, ATC,Diane E. Nicholson PhD, PT, NCS,Barry  Shultz PhD,Bruce A. MacWilliams PhD,Robin L. Marcus PhD, PT, OCS,Carolee  Moncur PhD, PT