Reliability, Validity, and Identification Ability of a Commercialized Waist-Attached Inertial Measurement Unit (IMU) Sensor-Based System in Fall Risk Assessment of Older People oleh Ke-Jing Li, Nicky Lok-Yi Wong, Man-Ching Law, Freddy Man-Hin Lam, Hoi-Ching Wong, Tsz-On Chan, Kit-Naam Wong, Yong-Ping Zheng, Qi-Yao Huang, Arnold Yu-Lok Wong, Timothy Chi-Yui Kwok, Christina Zong-Hao Ma