Regular mass screening for SARS-CoV-2 infection in care homes already affected by COVID-19 outbreaks: Implications of false positive test results. Issue 2 (February 2021) - Ladhani, Shamez N.; Chow, J. Yimmy; Atkin, Sara; Brown, Kevin E.; Ramsay, Mary E.; Randell, Paul; Sanderson, Frances; Junghans, Cornelia; Sendall, Kate; Downes, Rawlda; Sharp, David; Graham, Neil; et al.