Accepted for Publication: March 16, 2011.
Published Online: May 16, 2011. doi:10.1001/archdermatol.2011.122
Author Contributions: Drs J. Li and X. Chen had full access to all of the data in the study and take responsibility for the integrity of the data and the accuracy of the data analysis. Study concept and design: J. Li, X. Chen, and Xie. Acquisition of data: J. Li, Zhao, Hu, C. Chen, Ouyang, Liu, Ding, Shi, Kuang, and F. Li. Analysis and interpretation of data: J. Li, Hu, C. Chen, Ouyang, Su, and Chang. Drafting of the manuscript: J. Li, Zhao, Hu, and Ouyang. Critical revision of the manuscript for important intellectual content: X. Chen, C. Chen, Liu, Ding, Shi, Su, Kuang, Chang, F. Li, and Xie. Statistical analysis: J. Li, Hu, C. Chen, Su, and Kuang. Obtained funding: J. Li. Administrative, technical, and material support: Zhao, Liu, Ding, Shi, and F. Li. Study supervision: X. Chen and Xie.
Financial Disclosure: None reported.
Funding/Support: This study was supported in part by grant 2009sk3178 from the Social Development Support Program of Hunan Province, China.
Role of the Sponsors: The sponsors had no role in the design and conduct of the study; in the collection, analysis, and interpretation of data; or in the preparation, review, or approval of the manuscript.
Additional Contributions: Jianyang Hu, MD, and her colleagues at the maternal and child health hospital of Hunan province, Changsha, Hunan, contributed to this work. Linyong Xu, MD, provided statistical expertise.