RT Journal Article SR Electronic T1 Asymptomatic SARS-CoV-2 infection: the tip or the iceberg? JF Thorax JO Thorax FD BMJ Publishing Group Ltd and British Thoracic Society SP thoraxjnl-2020-215337 DO 10.1136/thoraxjnl-2020-215337 A1 Alexander J Keeley A1 Cariad M Evans A1 Thushan I de Silva YR 2020 UL http://thorax.bmj.com/content/early/2020/06/24/thoraxjnl-2020-215337.abstract AB