Funding for this research was provided by:
Natural Science Foundation of Hubei Province (2014CFA006)
Hubei Province Health and Family Planning Scientific Research Project (WJ2017H0002)
Article History
Received: 7 October 2018
Accepted: 27 February 2019
First Online: 25 March 2019
Compliance with ethical standards
:
: The authors disclose no potential conflicts of interest.