Published Online: February 27, 2014. doi:10.1001/jamafacial.2013.2565.
Study concept and design: Jiang, Chen.
Acquisition of data: All authors.
Analysis and interpretation of data: Jiang, Liu.
Drafting of the manuscript: Jiang, Chen.
Critical revision of the manuscript for important intellectual content: All authors.
Statistical analysis: All authors.
Administrative, technical, and material support: Jiang, Chen.
Study supervision: Liu, Chen.
Conflict of Interest Disclosures: None reported.