Funding for this research was provided by:
Science and Technology Department of Sichuan Province (No. 2017SZ0056)
Health Commission of Sichuan Province (No. 17PJ177)
Received: 22 May 2019
Accepted: 2 January 2020
First Online: 13 January 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 Declaration of Helsinki.
: Consent was obtained from the patients or their relatives.
: The authors declare that they have no competing interests.