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Contributors Only NI is the author and no additional contributorship exists.
Funding This work was supported in part by a research grant from the Japan Intractable Disease Research Foundation and by a Grant-in-Aid for Scientific Research C (18K0752) from the Japan Society for the Promotion of Science, Japan.
Competing interests NI has received research support from Mitsubishi Tanabe Pharma, Osoegawa Neurology Clinic, and Japan Blood Products Organization, honoraria from Mitsubishi Tanabe Pharma and Alexion, and is a consultant for Oxford Health Policy Forum CIC.
Patient consent for publication Not required.
Provenance and peer review Commissioned; internally peer reviewed.
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