Niu, Xuan http://orcid.org/0000-0003-2053-3421
Ou-Yang, Guang
Yan, Peng-fei
Huang, Shu-lan
Zhang, Zhen-tao
Zhang, Zhao-hui
Article History
Received: 23 December 2017
Revised: 21 January 2018
Accepted: 23 January 2018
First Online: 30 January 2018
Compliance with ethical standards
:
: The manuscript does not contain clinical studies or patient data.
: The authors declare that they have no conflict of interest.
: For this type of study formal consent is not required.