Xu, Miao
Du, Qingqing
Ma, Guanju
Chen, Zifan
Liu, Qingxia
Fu, Lihong
Cong, Bin
Li, Shujin
Funding for this research was provided by:
National Natural Science Foundation of China (81671875)
Natural Science Foundation of Hebei Province (H2017206351)
Article History
Received: 11 September 2018
Accepted: 15 January 2019
First Online: 28 January 2019
Compliance with ethical standards
: The ethical consent was obtained from the ethics committee of Hebei Medical University and statements on informed consent were signed by the adult volunteers and the parents of minors before the collection of blood samples
: The authors declare that they have no conflicts of interest.