Received: 26 December 2019
Accepted: 27 April 2020
First Online: 12 May 2020
Ethics approval and consent to participate
: The study protocol was approved by the local ethics committee (Sichuan University West China Hospital) and the study was performed according to the Declaration of Helsinki.
: All co-authors permit editorial amendments and the paper’s publication.
: The authors declare that they have no conflict of interest.