Zhang, Xuemei
Meng, Zhaowei
Li, Xue
Liu, Ming
Ren, Xiaojun
Zhu, Mei
He, Qing
Zhang, Qing
Song, Kun
Jia, Qiyu
Zhang, Chunmei
Wang, Xiaoran
Liu, Xiangxiang
Article History
Received: 28 June 2018
Accepted: 28 August 2018
First Online: 12 September 2018
Ethics approval and consent to participate
: The organizational review committee and the ethics committee of General Hospital Affiliated to Tianjin Medical University approved the ethics, methods and protocols of the survey. Signed informed consents were collected from all participants. We confirm that all methods were carried out in the light of the relevant guidelines and rules.
: Not applicable.
: The authors declare that they have no competing interests.
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