Li, Enyao http://orcid.org/0000-0002-9357-0875
Zhao, Pengju
Jian, Jie
Wu, Hong
Gao, Shuibo
Zhai, Hongyin
Article History
Received: 27 August 2018
Accepted: 10 December 2018
First Online: 2 January 2019
Compliance with Ethical Standards
: The study protocol was approved by the Medical Ethics Committee of the Fifth Affiliated Hospital of Zhengzhou University, and the guardians of all participants signed the informed consent form.
: The authors declare that they have no conflicts of interest.