Zhang, Xiaoqing
Xu, Mingkai
Li, Yanru
Su, Minmin
Xu, Ziyao
Wang, Chunyan
Kang, Dan
Li, Hongguang
Mu, Xin
Ding, Xiu
Xu, Wen
Wang, Xingjun
Han, Demin
Article History
Received: 15 October 2019
Revised: 18 December 2019
Accepted: 20 December 2019
First Online: 14 January 2020
Compliance with ethical standards
:
: The authors declare that they have no conflict of interest.
: All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.
: Informed consent was obtained from all individual participants’ guardians included in the study.