Funding for this research was provided by:
Scientific Research Projects of Guangzhou Municipal Education Bureau (1201620038)
Article History
Received: 17 February 2020
Accepted: 14 May 2020
First Online: 26 May 2020
Compliance with ethical standards
:
: The authors declare that they have no conflict of interests.
: This study was approved by the Ethics Committee of the first affiliated Hospital of Guangzhou Medical University.
: Informed and written consent was obtained from all participants.