Funding for this research was provided by:
UNICEF China (501 Health, Nutrition and Wash, Activity No. 184.108.40.206&220.127.116.11)
SORT IT program
Text and Data Mining valid from 2019-08-05
Received: 16 January 2019
Accepted: 9 July 2019
First Online: 5 August 2019
Ethics approval and consent to participate
: This study was reviewed and approved by the China Centre for Disease Control and Prevention Ethics Review board (No. 201819) and the Institutional Review Board of the National Centre for Women and Children’s Health, China CDC (No. FY2017–013). All participants provided informed consent/parental assent to participate in this study.
: The authors declare that they have no competing interests.