Zhang, Xinfang http://orcid.org/0000-0002-8042-5249
Shao, Ziqiang http://orcid.org/0000-0002-8461-4979
Zhou, Yi http://orcid.org/0000-0002-7401-9156
Wei, Jie http://orcid.org/0000-0002-7226-6970
He, Weidong http://orcid.org/0000-0002-0761-2208
Wang, Shuo http://orcid.org/0000-0002-1954-2323
Dai, Xiaofu http://orcid.org/0000-0001-6002-2269
Ren, Jiaying http://orcid.org/0000-0001-8014-460X
Article History
Received: 18 January 2019
Accepted: 10 May 2019
First Online: 28 May 2019
Compliance with ethical standards
:
: No conflict of interest exits in the submission of this manuscript.