Submitted for Publication: March 26, 2013; final revision received August 9, 2013; accepted September 13, 2013.
Published Online: November 7, 2013. doi:10.1001/jamaoto.2013.5542.
Study concept and design: Hato, Kohno.
Acquisition of data: Hato, Kohno, Yamada, Takahashi.
Analysis and interpretation of data: Hato, Gyo.
Drafting of the manuscript: Hato, Kohno, Yamada.
Critical revision of the manuscript for important intellectual content: Hato, Kohno, Takahashi, Gyo.
Statistical analysis: Hato.
Obtained funding: Hato, Yamada.
Administrative, technical, or material support: Kohno, Yamada, Takahashi.
Study supervision: Hato, Gyo.
Conflict of Interest Disclosures: None reported.
Funding/Support: This work was supported by Japan Society for the Promotion of Science KAKENHI grant No. 17591791.
Role of the Sponsors: The funder had no role in the design and conduct of the study; collection, management, analysis, and interpretation of the data; and preparation, review, or approval of the manuscript; and decision to submit the manuscript for publication.