Submitted for Publication: April 4, 2014; final revision received June 18, 2014; accepted July 22, 2014.
Published Online: September 18, 2014. doi:10.1001/jamaoto.2014.2009.
Study concept and design: Suzuki, Yasunaga, Fushimi, Yamasoba.
Acquisition, analysis, or interpretation of data: Suzuki, Yasunaga, Matsui, Horiguchi.
Drafting of the manuscript: Suzuki, Yasunaga, Matsui, Fushimi.
Critical revision of the manuscript for important intellectual content: Yasunaga, Horiguchi, Yamasoba.
Statistical analysis: Suzuki, Yasunaga, Matsui.
Obtained funding: Yasunaga.
Administrative, technical, or material support: Yasunaga, Matsui, Horiguchi, Yamasoba.
Study supervision: Yasunaga, Fushimi, Yamasoba.
Conflict of Interest Disclosures: None reported.
Funding/Support: This study was funded by grants from the Ministry of Health, Labor and Welfare, Japan (Research on Policy Planning and Evaluation grant No. H25-Policy-010), and the Council for Science and Technology Policy, Japan (Funding Program for World-Leading Innovative R&D on Science and Technology, FIRST program grant No. 0301002001001).
Role of the Funder/Sponsor: The funding institutions had no role in the design and conduct of the study; collection, management, analysis, and interpretation of the data; preparation, review, or approval of the manuscript; and decision to submit the manuscript for publication.