Kong, Qingyu
Yang, Xiaofei
Cai, Zhifeng
Pan, Yanyan
Wang, Minmin
Liu, Mengmeng
Zhao, Cuifen http://orcid.org/0000-0002-7274-8371
Funding for this research was provided by:
National Natural Science Foundation of China (30900730)
Article History
Received: 11 December 2018
Accepted: 29 January 2019
First Online: 13 February 2019
Compliance with ethical standards
:
: The authors declare that they have no competing interests.
: Not applicable.
: This study was approved by the ethics committee of Qilu Hospital of Shandong University, and all participants’ guardians were fully informed of the purpose and methods of the study.