Safety of BNT162b2 or CoronaVac COVID-19 vaccines in patients with heart failure: A self-controlled case series studyResearch in context by Xuxiao Ye, Caige Huang, Yue Wei, Silvia T.H. Li, Vincent K.C. Yan, Kai-Hang Yiu, Hung-Fat Tse, Tiantian Ma, Xiwen Qin, Celine S.L. Chui, Francisco T.T. Lai, Xue Li, Eric Y.F. Wan, Carlos K.H. Wong, Ian C.K. Wong, Esther W. Chan

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