Funding for this research was provided by:
national natural science foundation of china (81872180)
Received: 22 June 2021
Accepted: 27 July 2021
First Online: 16 August 2021
: Each author certifies that the study had obtained the approval from institutional review board of People’s Hospital, Peking University. The investigations were conducted in conformity with ethical principles of research, and that informed consent for participation in such type of study was obtained at admission. No specific IRB certification is needed for retrospective view of clinical cases at our institution. If further certificate is needed, we would like to provide at any time.
: Since our institution is a university affiliated hospital, all the inpatient patients need to sign a consent at admission, indicating their information, sample or tissue may be used for educational, research purpose. For a retrospective study, no specific consent is needed for data collection and publication according to regulation at the authors’ institutional.
: The authors declare that they have no competing interests.