Catherine M Dean1, Pamela W Duncan2. 1. C.M. Dean, PhD, MA, BAppSc, Department of Health Professions, Faculty of Medicine and Health Sciences, Macquarie University, Sydney, New South Wales, Australia. catherine.dean@mq.edu.au. 2. P.W. Duncan, PT, PhD, FAPTA, FAHA, Department of Neurology, Wake Forest Baptist Health, Winston Salem, North Carolina.