COVID-19: PCR screening of asymptomatic health-care workers at London hospital. Issue 10237 (23rd May 2020) - Treibel, Thomas A; Manisty, Charlotte; Burton, Maudrian; McKnight, Áine; Lambourne, Jonathan; Augusto, João B; Couto-Parada, Xosé; Cutino-Moguel, Teresa; Noursadeghi, Mahdad; Moon, James C