Submitted for Publication: November 27, 2013; final revision received January 22, 2014; accepted January 23, 2014.
Published Online: March 13, 2014. doi:10.1001/jamaoto.2014.84.
Study concept and design: Jiang, Shi.
Acquisition of data: Jiang, Wang.
Analysis and interpretation of data: Jiang, Chen, Shi.
Drafting of the manuscript: Jiang, Shi.
Critical revision of the manuscript for important intellectual content: Jiang, Wang, Chen, Shi.
Statistical analysis: Jiang, Wang.
Obtained funding: Jiang, Shi.
Administrative, technical, and material support: Chen, Shi.
Study supervision: Shi.
Conflict of Interest Disclosures: None reported.
Funding/Support: This work was supported by grant JY2011B02 from Shanghai Ninth People’s Hospital, affiliated with Shanghai Jiao Tong University School of Medicine.
Role of the Sponsor: The sponsor 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.