Funding for this research was provided by:
Scientific research fund for young anesthesiologists of the Chinese Association of Anesthesiologists (2201160900003)
Received: 2 May 2019
Accepted: 6 August 2019
First Online: 14 August 2019
Ethics approval and consent to participate
: The study was approved by the ethics committee of Peking University Third Hospital and the reference number was IRB00006761-M2016116, and we have obtained the informed consent which was written of all participants in the study.
: Not applicable.
: The authors declare that they have no competing interests.