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Contributors SI wrote this paper, ON supervised the manuscript writing and HH surpervised the writing and patient care. All authors approved the submission. The authors would like to thank Yoshiya Ishizawa and Shinya Yaguchi for their technical support.
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.
Provenance and peer review Not commissioned; internally peer reviewed.
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