Funding for this research was provided by:
National Natural Science Foundation of China Program (81601936)
Health and Family Planning Commission of Sichuan Province Program (17ZJ018, 17PJ124)
Article History
Received: 16 December 2017
Accepted: 23 January 2018
First Online: 2 February 2018
Compliance with ethical standards
: This study was registered in the Chinese Clinical Trial Registry (ChiCTR-INR-17010951). Approval was obtained from the Clinical Trials and Biomedical Ethics Committee of West China Hospital, and written informed consent was obtained from all the participants.
: The authors declare that they have no conflict of interest.