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Contributors HK wrote the first draft and all authors critically evaluated the manuscript.
Funding This work was supported by grants from the Ministry of Health, Labor and Welfare (Research on Rare and Intractable Diseases, H29-022) and the Ministry of Education, Culture, Sports, Science and Technology (17K09777) of Japan.
Competing interests None declared.
Patient consent Not required.
Provenance and peer review Commissioned; internally peer reviewed.
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