Hu, Yong http://orcid.org/0000-0001-7441-8539
Article History
Received: 5 June 2017
Revised: 19 March 2018
Accepted: 8 May 2018
First Online: 12 May 2018
Compliance with ethical standards
:
: As the author of this manuscript, I confirmed that there is no any possible conflict of interests in the manuscript. The mentioned funding in the “Acknowledgments” did not lead to any conflict of interests regarding the publication of this manuscript.