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Handling editor Iskander Chaudhry.
Correction notice This paper has been corrected since it was published Online First. New hyperlinks to the digital slides have been added.
Contributors C-TC wrote the original version of the article; C-HW and Y-ST provided the clinical information and drafted the manuscript; K-CC revised the manuscript and supervised the whole study.
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 Obtained.
Provenance and peer review Commissioned; internally peer reviewed.
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