Ethical Approval

CX Changyang Xing
YG Yuan Gao
XW Xinpei Wang
WX Wenjuan Xing
YL Yunnan Liu
YL Yujia Lei
XZ Xing Zhang
SZ Shu Zhang
LY Lijun Yuan
FG Feng Gao
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The study conformed to the latest Declaration of Helsinki and was approved by the Ethics Committee of The Fourth Military Medical University. Written informed consents were given by all the subjects.

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