Conflict of interest

The authors declare that they have no conflict of interest.

Ethical Approval

All procedures performed in studies involving human participants were in accordance with the Ethical Standards of the Institutional and/or National Research Committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.

Informed Consent

This study has obtained IRB approval from Ethics Committee of Beijing Tsinghua Changgung Hospital (approval number: 23350–0-01) and the need for informed consent was waived.

Consent for Publication

Consent for publication was obtained for every individual person’s data included in the study.