I. Introduction
Falls are common for the elderly and individuals with decreased independence or functional limitations [1]. For example, one third of people above 65 years of age have a fall every year [1]. Falls are also prevalent in stroke survivors at all stages of recovery [2]–[6]. Community-dwelling individuals with chronic stroke have the highest fall incidence at 46% [5]. These falls can cause serious or even life threatening injuries, such as hip fracture and head trauma [1]. Falls can also result in progressive activity and participation limitations, increased fear of falling, and depression. All these consequences compound to negatively impact fallers' qualities of life and increase caregivers' burdens.