1. Fujian Key Laboratory of Toxicant and Drug Toxicology, Medical CollegeNingde Normal University, Ningde, Fujian, P. R. China
2. Polyethylene Factory of Jilin Petrochemical Co. Ltd, Petrochina, Jilin, P. R. China
3. Department of Chemistry, College of Science, Northeastern University, Shenyang, P. R. China