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| Clinical Value of Speckle Tracking Techniques in Heart Failure with Ejection Fraction Preservation |
| FENG Huaping, HE Zhen, LI Zhiyong, DENG Wen, PENG Manfa |
| First-author's address: Department of Ultrasound, the Second People's Hospital of Jingdezhen, Jingdezhen 333000, China |
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