Received: 20 July 2020
Revised: 16 August 2020
Accepted: 17 August 2020
First Online: 19 October 2020
Compliance with ethical standards
: The authors declare that they have no conflict of interest.
: This study was approved by the Ethics Committee of Shenzhen Nanshan people’s Hospital, the 6th Affiliated Hospital of Shenzhen University Health Science Center. For this type of study, formal consent is not required.