Received: 8 October 2020
Accepted: 2 February 2021
First Online: 6 February 2021
Ethics approval and consent to participate
: This study was approved by the Medical Ethics Committee (The First Affiliated Hospital, Sun Yat-sen University), and an exemption from informed consent was obtained from our responsible Investigational Review Board.
: Not applicable.
: The authors declare that they have no competing interests.