Prevention of SARS-CoV-2 (COVID-19) transmission in residential aged care using ultraviolet light (PETRA): a two-arm crossover randomised controlled trial protocol oleh Amanda Brass, Andrew P. Shoubridge, Maria Crotty, Lidia Morawska, Scott C. Bell, Ming Qiao, Richard J. Woodman, Craig Whitehead, Maria C. Inacio, Caroline Miller, Megan Corlis, Nicolas Larby, Levi Elms, Sarah K. Sims, Steven L. Taylor, Erin Flynn, Lito E. Papanicolas, Geraint B. Rogers