Using Mobile Health Intervention to Improve Secondary Prevention of Coronary Heart Diseases in China: Mixed-Methods Feasibility Study by Chen, Shu, Gong, Enying, Kazi, Dhruv S, Gates, Ann B, Bai, Rong, Fu, Hua, Peng, Weixia, De La Cruz, Ginny, Chen, Lei, Liu, Xianxia, Su, Qingjie, Girerd, Nicolas, Karaye, Kamilu M, Alhabib, Khalid F, Yan, Lijing L, Schwalm, JD

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