Funding for this research was provided by:
the National Science Grant for Distinguished Young Scholars (81425001/H0104)
the National Key Technology Support Program from Ministry of Science and Technology (2015BAI12B11)
the Beijing Science and Technology Project (D151100002115004)
Received: 4 April 2020
Accepted: 19 August 2020
First Online: 12 September 2020
Ethics approval and consent to participate
: This study was approved by the China-Japan Friendship Hospital Ethics Committee (2015–85). Given that the study was retrospective and all data were anonymous, the requirement for informed consent was waived.
: Not applicable.
: The authors declare that they have no competing interests.