Funding for this research was provided by:
Guangzhou Haizhu District Science and Technology Program (2018-88)
Received: 18 May 2020
Accepted: 6 October 2020
First Online: 20 October 2020
Ethics approval and consent to participate
: This retrospective study was approved by the Ethics Committee of Guangdong Second Provincial General Hospital (2018-CSkWZ-009). All participants had signed informed consent before examinations.
: Not applicable.
: The authors declare that they have no conflicts of the interest and nothing to disclose.