Chen, Peiran
Li, Mingrong
Zhu, Jun
Wang, Yanping
Mu, Yi
Li, Qi
Dai, Li
Liu, Zheng
Liang, Juan
Liu, Hanming
Funding for this research was provided by:
the National Natural Science Foundation of China (No 81330016)
the China Medical Board (No 11-065)
WHO (No: CHN-12-MCN-004888)
UNICEF (No 2016EJH016, No 2016EJH016)
Article History
Received: 6 December 2019
Accepted: 8 July 2020
First Online: 7 August 2020
Competing interests
: The authors declare no competing interests.