Statistics from Altmetric.com
Contributors SK planned the study. All authors contributed to data acquisition. NK and AT analysed the data. KM wrote the first draft; all authors revised the draft paper.
Funding This work was supported in part by Health Sciences Research Grants (Comprehensive Research on Disability Health and Welfare and Research on Intractable Diseases) from the Ministry of Health, Labor and Welfare of Japan (H23-017).
Competing interests None declared.
Ethics approval Kindai University Ethics Committee.
Provenance and peer review Not commissioned; externally peer reviewed.
If you wish to reuse any or all of this article please use the link below which will take you to the Copyright Clearance Center’s RightsLink service. You will be able to get a quick price and instant permission to reuse the content in many different ways.