Funding for this research was provided by:
National Natural Science Foundation of China (81801892)
Wu Jieping Medical Foundation's special funding fund for clinical research (No.320.6750.17570)
Fundamental Research Funds for the Central Universities (No.2018SCU12036, the postdoctoral foundation of Sichuan University)
China Postdoctoral Science Foundation (2018M643492)
Article History
Received: 19 June 2019
Accepted: 25 July 2019
First Online: 5 August 2019
Ethics approval and consent to participate
: The clinical research ethics boards of the West China Hospital approved the study and waived the need for participants’ informed consent because of the study’s retrospective, anonymous, and non-interventional nature. All methods were performed in accordance with the relevant guidelines and regulations.
: Not applicable.
: The authors declare that they have no competing interests.