Received: 12 April 2021
Accepted: 3 July 2021
First Online: 21 July 2021
: The Ethics Commission of the First Affiliated Hospital of Guangzhou Medical University approved the study (No.2012-8). Volunteers provided voluntary, written informed consent before taking part in study procedures. Trial registration: ChiCTR-TRC-12002527, registered 20 September 2012 retrospectively (ExternalRef removed).
: Not applicable.
: There are no conflicts of interest to declare. There is also no non-author involvement in the preparation of the manuscript.