Development of a visualized risk prediction system for sarcopenia in older adults using machine learning: a cohort study based on CHARLS - Du, Jinsong; Tao, Xinru; Zhu, Le; Wang, Heming; Qi, Wenhao; Min, Xiaoqiang; Wei, Shujie; Zhang, Xiaoyan; Liu, Qiang (Frontiers in Public Health, 2025)