RETRACTED: Diagnosis of Early Left Ventricular Systolic Dysfunction by Layer-Specific Strain Echocardiography in

Ying-Yan Qiao1, Zhi-Min Hou2, Xiao-Mei Li2

  • 1Department of Ultrasound, Second Hospital of Shanxi Medical University, Taiyuan, China; Department of Ultrasound, Shanxi Coal Center Hospital, Taiyuan, China.

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