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Contributors SHC contributed to study concept and design. SHC and DHK acquired, analysed and interpreted the data. DHK and SHC drafted the manuscript. DHK, SHP and KWK performed statistical analysis. JHB, SYK, SSL, YMS, HJW and PNK made critical revisions to the manuscript. SHC and JHB supervised the study.
Competing interests None declared.
Provenance and peer review Not commissioned; externally peer reviewed.
Patient consent for publication Not required.
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