RT Journal Article SR Electronic T1 Severe aortic stenosis patient risk during the COVID-19 pandemic JF Open Heart JO Open Heart FD British Cardiovascular Society SP e001355 DO 10.1136/openhrt-2020-001355 VO 7 IS 2 A1 Jasimuddin Ahamed YR 2020 UL http://openheart.bmj.com/content/7/2/e001355.abstract AB