Older adults' perceptions and needs regarding mental health WeChat applet: a qualitative study. - Qiu, Yu-fei; Liu, Jia-li; Zeng, Li-juan; Yu, Yi-qing; Yue, Ya-ke; Gu, Juan; Tong, Meng-jie; Yang, Fen; Chen, Gang; Han, Yang-yang (BMC Psychiatry, 2025)