Chen, Qi
Sun, Hong
Zhang, Jiayao
Xu, Yan
Ding, Zhen
Funding for this research was provided by:
Jiangsu social development project (BE2018745)
Key Talent Project for Medical Young Scholars of Jiangsu Province (QNRC2016551)
Article History
Received: 27 August 2018
Accepted: 5 February 2019
First Online: 14 February 2019
Compliance with ethical standards
:
: The data that support the findings of this study are available from Jiangsu Provincial Commission of Health and Family Planning; however, restrictions apply regarding the availability of these data, which were used under a license for the current study, and the data are not publicly available. Data are however available from the authors upon reasonable request and with permission of Jiangsu Provincial Commission of Health and Family Planning.
: Not applicable.
: The study protocol was approved by the Ethic Commission of Jiangsu Provincial Center for Disease Control and Prevention; all study participants provided written informed consent.
: The authors declare that they have no competing interests.