Tai Chi for Reducing Dual-task Gait Variability, a Potential Mediator of Fall Risk in Parkinson’s Disease: A Pilot Randomized Controlled Trial oleh Gloria Vergara-Diaz MD, Kamila Osypiuk MS, Jeffrey M Hausdorff PhD, Paolo Bonato PhD, Brian J Gow BS, Jose GV Miranda PhD, Lewis R Sudarsky MD, Daniel Tarsy MD, Michael D Fox MD, Paula Gardiner MD, Cathi A Thomas MS, Eric A Macklin PhD, Peter M Wayne PhD