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About the article
Published Online: 2016-07-06
Published in Print: 2016-08-01
Author contributions: JT and KK conceived and designed the study and obtained funding. JT, YT, and YO collected and analyzed the data. YT and YK recruited patients. JT wrote the draft, with critical revision from all authors. All the authors have accepted responsibility for the entire content of this submitted manuscript and approved submission.
Research funding: Part of this study was supported by a Grant-in-Aid for Scientific Research (C) from the Japanese Society for the Promotion of Science (No. 24591614).
Employment or leadership: None declared.
Honorarium: None declared.
Competing interests: The funding organization(s) played no role in the study design; in the collection, analysis, and interpretation of data; in the writing of the report; or in the decision to submit the report for publication.