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In this April 5, 2020, file photo, a man checks his mobile phone along the Yangtze River in Wuhan in central China's Hubei province. As governments around the world consider how to monitor new coronavirus outbreaks while reopening their societies, many are starting to bet on smartphone apps to help stanch the pandemic. (AP Photo/Ng Han Guan, File)

In this April 5, 2020, file photo, a man checks his mobile phone along the Yangtze River in Wuhan in central China's Hubei province. As governments around the world consider how to monitor new coronavirus outbreaks while reopening their societies, many are starting to bet on smartphone apps to help stanch the pandemic. (AP Photo/Ng Han Guan, File)

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