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APA Citation
Chen, F., Fu, D., Yang, Q., Geng, Z., Xia, J., Wang, Z., & Wang, L. (2020). low transmission risk of 9 asymptomatic carriers tested positive for both SARS-CoV-2 nucleic acid and serum IgG. Journal of infection, 81(3), 452–482. http://access.bl.uk/ark:/81055/vdc_100105906932.0x000053