RT Journal Article SR Electronic T1 Perception is not reality when risk stratifying adults with congenital heart disease for COVID-19 JF Open Heart JO Open Heart FD British Cardiovascular Society SP e001660 DO 10.1136/openhrt-2021-001660 VO 8 IS 1 A1 Su Yuan A1 Erwin Oechslin YR 2021 UL http://openheart.bmj.com/content/8/1/e001660.abstract AB