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| \  / ||  \ \\/ // |  __ \\    / _ \\   /_   _// 
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|_|\/|_||    |_||   |_____//  |_||  |_||   |_||   
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Text this: Use of a real-time locating system for contact tracing of health care workers during the COVID-19 pandemic at an infectious disease center in Singapore : validation study