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Footnotes
Handling editor Josef S Smolen
Contributors Corresponding author JCCW had full access to all the data in the study and takes responsibility for the integrity of the data and the accuracy of the data analysis. Study concept and design: JCCW. Acquisition, analysis or interpretation of data: JCCW and Y-HW. Drafting of the manuscript: Y-TL and M-CC. Critical revision of the manuscript for important intellectual content: JCCW, H-KT, J-YC and Y-HW.
Funding The authors have not declared a specific grant for this research from any funding agency in the public, commercial or not-for-profit sectors.
Competing interests None declared.
Patient consent for publication Not required.
Provenance and peer review Not commissioned; externally peer reviewed.