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More details can be found in Multimedia Appendix 1 and Xia et al [28].
From April 2020 to April 2021 (Figure 3a), 3845 healthy participants (COVID-19–negative) and 1456 COVID-19–positive participants contributed audio samples with positive or negative clinical self-reported test results for at least 1 day. We used these participants' data if 5 or more samples were provided, resulting in 447 (11.6%) and 168 (11.5%) negatively and positively tested participants, respectively.
J Med Internet Res 2022;24(6):e37004
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