Funding for this research was provided by:
National Natural Science Foundation of China (81625014)
Received: 25 August 2019
Accepted: 30 March 2020
First Online: 24 May 2020
Ethics approval and consent to participate
: This study was approved by the Ethical Committee of Peking University People’s Hospital. Informed consent was not needed as this was a retrospective study and the medical records and patient information were anonymously reviewed.
: Not applicable as no human subjects.
: The authors declare that they have no competing interests.