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Colorado COVID exposure app rarely worked, investigation found

Colorado COVID exposure app rarely worked, investigation found
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United statesSan franciscoScott bookmanSarah tunebergSusie weltyAnn rollinsZack newmanAnna hewsonCo exposure notification appUniversity of californiaCo exposure notificationInstitute of global health sciencesAssociation of public health laboratoriesColorado department of public healthColorado exposure appNotification app