Submitted for Publication: March 24, 2014; final revision received August 26, 2014; accepted September 3, 2014.
Published Online: October 23, 2014. doi:10.1001/jamaoto.2014.2613.
Study concept and design: Hakuba, Hato.
Acquisition, analysis, or interpretation of data: Hakuba, Okada, Mise, Gyo.
Drafting of the manuscript: Hakuba, Hato, Okada.
Critical revision of the manuscript for important intellectual content: Hakuba, Mise, Gyo.
Statistical analysis: Mise, Gyo.
Obtained funding: Hakuba.
Administrative, technical, or material support: Hato, Gyo.
Study supervision: Hakuba, Hato, Gyo.
Conflict of Interest Disclosures: None reported.
Funding/Support: This study was supported by grants-in-aid for scientific research (23592486) from the Ministry of Education, Science and Culture, Japan.
Role of the Sponsor: The Ministry of Education, Science and Culture 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.