Middle-aged and elderly users' continuous usage intention of health maintenance-oriented WeChat official accounts: empirical study based on a hybrid model in China. - Lin Xu; Pengfei Li; Xiaorong Hou; Hongfan Yu; Tingting Tang; Ting Liu; Shoushu Xiang; Xiaoqian Wu; Cheng Huang (BMC Medical Informatics Decis. Mak., 2021)