RT Journal Article SR Electronic T1 Need for expertise in mitral valve regurgitation JF Open Heart JO Open Heart FD British Cardiovascular Society SP e001039 DO 10.1136/openhrt-2019-001039 VO 6 IS 1 A1 Erwan Donal A1 Elena Galli A1 Thierry Letourneau YR 2019 UL http://openheart.bmj.com/content/6/1/e001039.abstract AB