Wang, Chenbing http://orcid.org/0000-0001-5898-4143
Liu, Jinlong
Liu, Yanbo
Qin, Boheng
He, Dongning
Funding for this research was provided by:
Shaanxi Health and Family Planning Commission (No. 2015112)
Article History
Received: 21 April 2019
Accepted: 16 November 2019
First Online: 21 January 2020
Compliance with ethical standards
:
: The authors declared that they have no conflict of interest.