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Handling editor Josef S Smolen
H-YM and JCCW contributed equally.
Contributors H-YM and JCCW conceptualised the research and drafted the manuscripts. X-HC interpreted the data and drafted the manuscript. H-HC contributed to the research design, performed data analysis and graph generation and critically revised the manuscript. All authors have read and approved the final manuscript.
Funding This work was supported by funding from Chung Shan Medical University Hospital grant number CSH-2018-C-023 and the National Natural Science Foundation of China Grants [81 760 298].
Competing interests None declared.
Patient and public involvement The requirement for informed consent was waived because personal details were completely anonymised before analysis of data.
Patient consent for publication Not required.
Ethics approval This study was approved by the Institutional Review Board of Taichung Veterans General Hospital in Taiwan (approval number: CE17100B).
Provenance and peer review Not commissioned; externally peer reviewed.