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E-mail: yangwenn@yeah.net
Conceived and designed the experiments: CD ZJH WY.
Performed the experiments: HL GQ DW.
Analyzed the data: CD ZJH.
Contributed reagents/materials/analysis tools: JH BD WL LL YY YH LZ ZS LN QW HD JZ HL GQ DW.
Wrote the paper: CD ZJH MCM FYW.
We are grateful to the Liangshan Government for supporting the project.
We thank doctors from the People's Hospital of Liangshan Prefecture and Butuo County Hospital, and lab technicians from the Butuo County Hospital and Lianshan Center for Disease Control and Prevention for their assistance.
We thank all the patients and their families who participated in this study.
Competing Interests: The authors have declared that no competing interests exist.
This study was supported by grants from the Mega-Project for National Science and Technology Development under the “11th and 12th, Five-Year Plan of China” (2009ZX10004-905, 2011ZX10001-002).
© 2014 Dong et al.