Article History
Received: 12 August 2019
Accepted: 29 July 2020
First Online: 14 August 2020
Ethics approval and consent to participate
: The study was approved by the Ethical Committee of West China Hospital, Sichuan University. According to the rules of the hospital’s medical ethics committee, this study fulfilled the criteria of exception to the requirements of informed consent.
: Not applicable.
: The authors declare that they have no competing interests.