Identification of characteristics of foot position and angle during swing phase in fallers using principal component analysis. - Inai T; Kobayashi Y; Huang C; Fujita K; Fujimoto M; Nihey F; Yamamoto A; Nakajima K; Nakahara K; Kutsuzawa G; Fukushi K; Kudo S (Frontiers in bioengineering and biotechnology, 2023)