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Authors
Li, Hengcun
Zhang, Zheng
Chen, Lei
Sun, Xiujing
Zhao, Yu
Guo, Qingdong
Zhu, Shengtao
Li, Peng
Min, Li
Zhang, Shutian https://orcid.org/0000-0003-2356-4397
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Article History
Received: 12 July 2018
Revised: 29 November 2018
Accepted: 17 January 2019
First Online: 6 February 2019
Conflict of interest
: The authors declare that they have no conflict of interest.
: The study was subject to approval by the ethics committee of Beijing Friendship Hospital, Capital Medical University. The study was performed in accordance with the Declaration of Helsinki.
