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Dear Editor, Since December 2019, an outbreak of novel coronavirus (SARS-CoV-2) that began from Wuhan, Hubei Province, has rapidly spread to 34 provincial-level divisions of China [[1]] and 25 countries around the world [[2]]. The estimated mortality rate is 3.1% in Wuhan, 2.8% in Hubei Province, 0.6% in other provinces of China, 2.4% in China and 0.4% in other countries, respectively. Real-time reproduction number R(t) with 95% confidence interval of COVID-19 in a China, b outside Hubei, c Hubei Province and d Wuhan. [Extracted from the article]