Changes in Mobile Health Apps Usage Before and After the COVID-19 Outbreak in China: Semilongitudinal Survey by Le Yang, Jiadong Wu, Xiaoxiao Mo, Yaqin Chen, Shanshan Huang, Linlin Zhou, Jiaqi Dai, Linna Xie, Siyu Chen, Hao Shang, Beibei Rao, Bingtao Weng, Ayiguli Abulimiti, Siying Wu, Xiaoxu Xie

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