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Novel Strain Rate Index of Contractility Loss Caused by Mechanical DyssynchronyIwano, Hiroyuki; Yamada, Satoshi; Watanabe, Masaya; Mitsuyama, Hirofumi; Nishino, Hisao; Yokoyama, Shinobu; Kaga, Sanae; Nishida, Mutsumi; Yokoshiki, Hisashi; Onozuka, Hisao; Mikami, Taisei; Tsutsui, Hiroyuki · Circulation Journal · 2011