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About the article
Published Online: 2016-05-11
Published in Print: 2016-07-01
Author contributions: All the authors have accepted responsibility for the entire content of this submitted manuscript and approved submission.
Research funding: This work was partly supported by a Grant-in-Aid for Creative Bio-scientific Research from Asahikawa Medical College.
Employment or leadership: None declared.
Honorarium: None declared.
Competing interests: The funding organisation(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.