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Contributors YW and KS conceived of the idea. NK and HA wrote the initial draft of the manuscript. TM developed the manuscript. MI selected the images. All authors discussed the results and contributed to the final manuscript. All authors met the International Committee of Medical Journal Editors authorship criteria.
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; internally peer reviewed.
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