SARS-CoV-2 infection in London, England: changes to community point prevalence around lockdown time, March–May 2020
Michael Edelstein, Chinelo Obi, Meera Chand, Susan Hopkins, Kevin Brown, Mary Ramsay
J Epidemiol Community Health Feb 2021, 75 (2) 185-188; DOI: 10.1136/jech-2020-214730