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Contributors KA was involved in designing of the study, reviewing of the literature, performing M-TAPA and pinprick tests, data review and collection, and preparation of the manuscript. IY was involved with data review and analysis, and editing the manuscript, especially regarding the statistics. YMaeda was involved in performing pinprick tests, reviewing and collecting data. YMorimoto was involved with conception and editing the manuscript.
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; externally peer reviewed.