Wu, Jinzhu http://orcid.org/0000-0003-0219-9968
Feng, Yaxiu http://orcid.org/0000-0002-9488-8404
Shao, Yanbin http://orcid.org/0000-0002-6296-5348
Zhou, Jia http://orcid.org/0000-0001-5418-5141
Wu, Xiaohong http://orcid.org/0000-0003-3174-3344
Article History
Received: 21 October 2017
Accepted: 6 February 2018
First Online: 12 February 2018
Compliance with ethical standards
:
: This contribution has been approved by all coauthors, it has been published before, it is not under consideration for publication anywhere else, and there is no conflict of interest.