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Contributors SK wrote the first draft and edited it by himself.
Funding This work was supported in part by the Health and Labour Sciences Research Grant on Intractable Diseases (Neuroimmunological Diseases) from the Ministry of Health, Labour and Welfare of Japan (20FC1030).
Competing interests SK reports grants from the Ministry of Health, Labour and Welfare of Japan during the conduct of the study; grants from Teijin, grants from Japan Blood Product Organization; grants from Nihon Pharmaceutical; personal fees from Teijin, Japan Blood Product Organization, Nihon Pharmaceutical and CSL Behring, outside the submitted work.
Patient consent for publication Not required.
Provenance and peer review Commissioned; internally peer reviewed.
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