VIVALDI-CT shaping care home COVID-19 testing policy: A pragmatic cluster randomised controlled trial of asymptomatic testing compared to standard care in care home staff - Oliver Stirrup; James Blackstone; Iona Cullen-Stephenson; Robert Fenner; Natalie Adams; Ruth Leiser; Maria Krutikov; Borscha Azmi; Nick Freemantle; Adam Gordon; Martyn Regan; Martin Knapp; et al. (PLoS ONE, 2025)