About the Authors

Dandan Li

Affiliation Department of Epidemiology, Public Health College, Harbin Medical University, Harbin, Heilongjiang Province, P. R. China

Fulan Hu

Affiliation Department of Epidemiology, Public Health College, Harbin Medical University, Harbin, Heilongjiang Province, P. R. China

Fan Wang

Affiliation Department of Epidemiology, Public Health College, Harbin Medical University, Harbin, Heilongjiang Province, P. R. China

Binbin Cui

Affiliation Department of Abdominal Surgery, The Tumor Hospital of Harbin Medical University, Harbin, Heilongjiang Province, P. R. China

Xinshu Dong

Affiliation Department of Abdominal Surgery, The Tumor Hospital of Harbin Medical University, Harbin, Heilongjiang Province, P. R. China

Wencui Zhang

Affiliation Department of Epidemiology, Public Health College, Harbin Medical University, Harbin, Heilongjiang Province, P. R. China

Chunqing Lin

Affiliation Department of Epidemiology, Public Health College, Harbin Medical University, Harbin, Heilongjiang Province, P. R. China

Xia Li

Affiliation Department of Epidemiology, Public Health College, Harbin Medical University, Harbin, Heilongjiang Province, P. R. China

Da Wang

Affiliation Department of Science and Technology Administration, Harbin Medical University, Harbin, Heilongjiang Province, P. R. China

Yashuang Zhao

zhao_yashuang@263.net

Affiliation Department of Epidemiology, Public Health College, Harbin Medical University, Harbin, Heilongjiang Province, P. R. China

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Method consulting: BC XD. Literature collection: WZ CL XL DW. Conceived and designed the experiments: YZ. Performed the experiments: DL. Analyzed the data: DL. Contributed reagents/materials/analysis tools: DL FH FW. Wrote the paper: DL YZ.