Cathy Harro, Michael J Shoemaker, O Frey, A Gamble, et al.. "Effects of Two Externally-Cued Locomotor Training Protocols on Gait and Balance Function in Individuals with Idiopathic Parkinson’s Disease: A Randomized Controlled Trial" American Physical Therapy Association Combined Sections Meeting (2013)
Available at: http://works.bepress.com/michael_shoemaker/30/