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On January 3, 2020, the World Health Organization was notified of 44 patients in Wuhan, China experiencing pneumonia of unknown cause, which was later identified as coronavirus disease 2019 (COVID-19) caused by severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2). Within 1 month the disease spread far beyond Wuhan, a city with a population of 11 million, and infected nearly 10,000 people in China.1 As the number of infected individuals continued to rise exponentially, China’s closest neighbors, such as Taiwan, Japan, and South Korea, soon faced the risk of their residents being infected.
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Hsu et al. (2020) studied this question.
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