“…Cardiac magnetic resonance imaging (CMR) was used to assess LVEF in nine studies [14][15][16][17]29,32,33,40,41 while echocardiography was used in 10 studies. 22,24,26,31,36,37,39,[43][44][45] Other studies used left ventriculography 13,20,21,23,25,28,34,35,42,46 or nuclear imaging, 27,38 or did not specify the method used for assessing LVEF. 18,19,30 The…”