Article History
Received: 2 December 2019
Accepted: 26 July 2020
First Online: 12 August 2020
Ethics approval and consent to participate
: This study was conducted according to the Helsinki II Declaration and approved by the ethics committee at the National Institute of Parasitic Diseases, Chinese Center for Disease Control and Prevention. The data used in this study was anonymised before its use.
: The written informed consent was obtained from every participant in this study.
: The authors state that they have no competing interests to declare.