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12. https://www.cdc.gov/coronavirus/2019-ncov/php/contact-tracing/case-investigator-guide.html 13. https://www.thelancet.com/journals/laninf/文章/PIIS1473-3099(18)30656-X/全文 14。 https://www.cdc.gov/coronavirus/2019-ncov/php/contact-tracing/contact-tracing-plan/digital-contact-tr
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