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To the Editor—The outbreak of the 2019 novel coronavirus disease (COVID-19) infection in Wuhan has rapidly and widely spread nationwide and to other countries, which has caused an exponential increase in patients with infection. As of 23 March 2020, the number of confirmed cases of COVID-19 infection increased to 81 171 in the Chinese mainland, including 3277 deaths and 1573 patients in critical condition [1]. With the national fight to combat the COVID-19 for about 60 days after Wuhan was sealed off, the number of confirmed cases in China, including in Hubei province, has continued to decline and suspected cases nationwide have also dropped sharply. However, the number of cases of infection in other countries is still rising, with a rapid increase in Europe, especially in Italy, and other parts of the world. A total of 302 704 patients with confirmed disease and 28 342 deaths have been reported in …