Funding for this research was provided by:
Fujian Provincial Department of Science and Technology (2019Y2001)
Article History
Received: 14 September 2020
Accepted: 17 February 2021
First Online: 23 February 2021
Ethics approval and consent to participate
: This study was conducted in accordance with the Declaration of Helsinki. Ethics approval was obtained from the Ethics Committee of Fujian Provincial CDC (No. 2017002). Written informed consent was obtained from every participant or the guardian of the children before their urine samples were collected.
: Not applicable.
: None of the authors has conflict of interest to declare.