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Contributors HS, YT, MS and MH were involved in conception, design and interpretation of the data. HS, NT and IK were involved in analysis of the data. HS, NT, IK, MS and MH were involved in drafting of the paper. All authors were involved in approval of the final version.
Funding This work was supported by Health Labour Sciences Research Grant for Research on Measures for Intractable Diseases from the Japanese Ministry of Health, Labour and Welfare (H22-Nanchi-Ippan-029 and H23-Nanchi-Ippan-107, HS, NT, IK), Research Grant from the Japan Epilepsy Research Foundation (H22–5, HS) and Research Support from Kawano Masanori Memorial Public Interest Incorporated Foundation for Promotion of Pediatrics (20-Young-3, HS).
Competing interests None.
Ethics approval Institutional Review Board of the National Center of Neurology and Psychiatry (No. 21-9-2) and the Tokyo Metropolitan Institute of Medical Science (No. 12–34).
Provenance and peer review Not commissioned; externally peer reviewed.
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