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Handling editor Josef S Smolen
Contributors K-TT designed and conceived the study, conducted data analysis, and drafted and revised the manuscript. B-JT and K-CK conducted data analysis. Y-HC, C-HL and D-YC generated the original hypothesis, acquired database, conducted data analysis and drafted and revised the manuscript.
Funding This study was supported in part by grants from Taichung Veterans General Hospital, Taiwan (TCVGH-NHRI10703, TCVGH-1077310C, TCVGH-1077325D, TCVGH-107G211, TCVGH-YM1070203).
Competing interests None declared.
Patient consent for publication Not required.
Provenance and peer review Not commissioned; externally peer reviewed.