Funding for this research was provided by:
National Science Foundation of China (71904166)
Yunnan high-level medical cultivation programme (H-2018103)
Received: 13 May 2021
Accepted: 20 July 2021
First Online: 3 August 2021
Change Date: 1 September 2021
Change Type: Correction
Change Details: A Correction to this paper has been published:
Change Details: https://doi.org/10.1186/s40249-021-00899-0
: All patients were informed about the study objective, and they were assured of confidentiality. They were asked to indicate their agreement and understanding with a signed informed consent form before the investigation. The study was approved by the ethics research committee of Yunnan Centers for Disease Control and Prevention, China (No. YNCDC/QR-KJB-2021-003).
: Not applicable.
: The authors declare that they have no competing interest.