Funding for this research was provided by:
Youth Project of National Natural Science Foundation (81200400)
top-notch innovative talents project and Fujian project (2016Y9025, 2016J06018, 2017I0004)
Fujian Medical University teaching reform project (Y17005)
Fujian Provincial Health and Family planning Commission Youth Research Project (2017-1-6)
Article History
First Online: 8 November 2018
Compliance with Ethical Standards
:
: This work was supported by Youth Project of National Natural Science Foundation (Grant no. 81200400), top-notch innovative talents project and Fujian project (Grants 2016Y9025 & 2016J06018 & 2017I0004); Fujian Medical University teaching reform project (Y17005) and Fujian Provincial Health and Family planning Commission Youth Research Project (2017-1-6).
: Yaqun Hong, Xiaofan Li, Bo Wan, Nainong Li, and Yuanzhong Chen declare that they have no conflict of interest.
Free to read: This content has been made available to all.