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1. Association of rideshare-based transportation services and missed primary care appointments: a clinical trial

3. Enforcement policy for viral transport media during the Coronavirus disease 2019 (COVID-19) public health emergency: guidance for commercial manufacturers, clinical laboratories, and Food and Drug Administration staff

4. Enforcement policy for viral transport media during the coronavirus disease 2019 (COVID19) public health emergency (revised): guidance for commercial manufacturers, clinical laboratories, and Food and Drug Administration staff