Funding for this research was provided by:
Scientific Research Seed Fund of Peking University First Hospital Project (2019SF37)
Article History
Received: 24 May 2019
Accepted: 12 August 2019
First Online: 19 August 2019
Ethics approval and consent to participate
: The study protocol was approved by the institutional review board of Peking University First Hospital. Informed consent was provided by all participants.
: Not applicable.
: The authors declare that they have no competing interests.