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Handling editor Iskander Chaudhry.
Correction notice This paper has been corrected since it was published Online First. New hyperlinks for the digital slides have been added.
Contributors YTY collected the clinical data and wrote the paper; SS, KT performed and analysed the FISH studies; LJM clinically reviewed and revised the paper; KCC conducted the whole study and revised the paper.
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 Parental/Guardian consent obtained.
Provenance and peer review Commissioned; internally peer reviewed.
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