Does clinically measured walking capacity contribute to real-world walking performance in Parkinson's disease?

Jenna A. Zajac, James T. Cavanaugh, Teresa Baker, Ryan P. Duncan, Daniel Fulford, Jaimie Girnis, Michael LaValley, Timothy Nordahl, Franchino Porciuncula, Kerri S. Rawson, Marie Saint-Hilaire, Cathi A. Thomas, Gammon M. Earhart, Terry D. Ellis