RT Book, Whole SR Electronic A2 Fabre, Aurelie A2 Hurst, John R. A2 Ramjug, Sheila T1 COVID-19 YR 2021 SN 978-1-84984-149-8 DO 10.1183/2312508X.erm9421 OP 274 UL https://books.ersjournals.com/content/9781849841498/9781849841498