Shi, Huilan
Jia, Junya
Li, Dong
Wei, Li
Shang, Wenya
Zheng, Zhenfeng
Article History
Received: 28 October 2015
Accepted: 11 December 2017
First Online: 9 February 2018
Ethics approval and consent to participate
: The study was approved by the ethical committee of Tianjin Medical University General Hospital. The written informed consent was obtained from each participant prior to data collection. If participants’ age were less than 16 years old, the informed consents were obtained by his/her parents or legal guardians.
: Not applicable.
: The authors declare that they have no competing interests.
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