Exercising with face masks on at Victoria Park, Causeway Bay, amid a coronavirus outbreak in Hong Kong, on March 27. Photo: Dickson Lee Exercising with face masks on at Victoria Park, Causeway Bay, amid a coronavirus outbreak in Hong Kong, on March 27. Photo: Dickson Lee
Exercising with face masks on at Victoria Park, Causeway Bay, amid a coronavirus outbreak in Hong Kong, on March 27. Photo: Dickson Lee

Letters | Coronavirus tracking: what about data and health risks in digital contact tracing by smartphone?

Topic |   Coronavirus pandemic
Exercising with face masks on at Victoria Park, Causeway Bay, amid a coronavirus outbreak in Hong Kong, on March 27. Photo: Dickson Lee Exercising with face masks on at Victoria Park, Causeway Bay, amid a coronavirus outbreak in Hong Kong, on March 27. Photo: Dickson Lee
Exercising with face masks on at Victoria Park, Causeway Bay, amid a coronavirus outbreak in Hong Kong, on March 27. Photo: Dickson Lee
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