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Contributors ZY and MSO contributed to the original write-up of the manuscript. ZY, RB and BS contributed to patient care and revision of the manuscript in their respective specialty. RB provided the high-quality images and the figure captions.
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 Not commissioned. Externally peer reviewed by Jeremy Rees, London, UK.
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