RT Journal Article SR Electronic T1 Optimal use of echocardiography in valvular heart disease evaluation JF Heart JO Heart FD BMJ Publishing Group Ltd and British Cardiovascular Society SP 977 OP 986 DO 10.1136/heartjnl-2014-306293 VO 101 IS 12 A1 Robert J Siegel A1 Huai Luo A1 Moody Makar A1 Roy Beigel YR 2015 UL http://heart.bmj.com/content/101/12/977.abstract AB