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About the article
Published Online: 2019-06-07
Published in Print: 2019-10-25
Author contributions: All the authors have accepted responsibility for the entire content of this submitted manuscript and approved submission.
Research funding: Y.F., J.T., Y.O., T.I. and S.U. have no conflict of interest. T.M. received a research grant from NIPRO.
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.