Cross-Sectional Analysis of Backward, Forward, and Dual Task Gait Kinematics in People With Parkinson Disease With and Without Freezing of Gait. - Myers, Peter S.; Rawson, Kerri S.; Harrison, Elinor C.; Horin, Adam P.; Sutter, Ellen N.; McNeely, Marie E.; Earhart, Gammon M. (Journal of Applied Biomechanics, 2020)