Aggarwal, D., Page, A. J., Schaefer, U., Savva, G. M., Myers, R., Volz, E., … Harrison, E. M. (2021). An integrated analysis of contact tracing and genomics to assess the efficacy of travel restrictions on SARS-CoV-2 introduction and transmission in England from June to September, 2020. medRxiv. https://doi.org/10.1101/2021.03.15.21253590.