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. 2020 Jul 9;220(8):463–471. doi: 10.1016/j.rceng.2020.05.008

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Distribution of symptom onset for patients with confirmed COVID-19 through laboratory testing: imported cases (orange), imported contact cases (grey), local contact cases (yellow). The line in the figure shows the cumulative cases of COVID-19 between the 17th of February and the 30th of April 2020.