Received: 16 December 2019
Accepted: 18 May 2020
First Online: 29 May 2020
Ethics approval and consent to participate
: Ethical approval was obtained from ethics committee of Guizhou Provincial People’s Hospital, the affiliated hospital of Guizhou Medical University, and Sir Run Run Shaw Hospital. The study was performed in accordance with the ethical principles set forth in Helsinki declaration. Written informed consent was obtained from all participants.
: Not applicable.
: The authors declare that they have no competing interests.