Bi, Huitao
Guo, Meili
Wang, Jiawan
Qu, Ying
Du, Wenli
Zhang, Kaiming
Article History
Received: 3 October 2016
Revised: 12 July 2017
Accepted: 18 November 2017
First Online: 12 December 2017
Compliance with ethical standards
:
: The authors declare no conflict of interest. The founding sponsors had no role in the design of the study; in the collection, analyses, or interpretation of data; in the writing of the manuscript, and in the decision to publish the results.