Cai, Li http://orcid.org/0000-0002-8579-5986
Ma, Bingjie
Lin, Lizi http://orcid.org/0000-0003-4828-6848
Chen, Yajun
Yang, Wenhan
Ma, Jun
Jing, Jin
Funding for this research was provided by:
special research grant for non-profit public service of the ministry of health in Chin
Article History
Received: 15 December 2017
Accepted: 7 December 2018
First Online: 5 February 2019
Competing Interests
: The authors declare no competing interests.