Funding for this research was provided by:
National Natural Science Foundation of China (51575188)
Received: 11 December 2019
Accepted: 13 April 2020
First Online: 28 April 2020
Ethics approval and consent to participate
: Informed consent was obtained from all participants to complete the protocol approved by the Guangzhou First People’s Hospital Department of Ethics Committee.
: The authors received consent for the publication of the photographs used within the manuscript.
: The authors declare that they have no competing interests.