SU Lin 1, SUN Li-Xin 1, ZHANG Qing-Wen 1, ZHAO Zhi-Gang 2, and ZHANG Wan-Lei 3
1.Department of Gerontology,3.Department of Ultrasound,The Peoples Hospital of Beijing University, Beijing 100044, China; 2.The First Peoples Hospital of Shi jiazhuang,Hebei 050011
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