Funding for this research was provided by:
the International Cooperation Project of Guangzhou Science and Technology Program (2016201604030021)
the National Grant Program on key Infectious Disease (2014ZX10002002-002)
Received: 8 July 2019
Accepted: 7 July 2020
First Online: 14 July 2020
Ethics approval and consent to participate
: We have read and complied with the policy of the journal on ethical consent, as stated in the Guide to Authors. The study was approved by the Institutional Review Board of the Sun Yat-sen University, and the work was carried out in accordance with The Code of Ethics of the World Medical Association (Declaration of Helsinki) for experiments involving humans and Uniform Requirements for Manuscripts Submitted to Biomedical journals. Written informed consent was obtained from all patients. The privacy rights of human subjects were always observed.
: Not applicable.
: The authors declare that they have no competing interests.