1. Department of Medicinal Chemistry and the Masonic Cancer Center, University of Minnesota - Twin Cities, Minneapolis, Minnesota 55455, United States
2. Department of Environmental Science, Stockholm University, SE-106 91 Stockholm, Sweden
3. State Key Laboratory of Environmental Chemistry and Ecotoxicology, Beijing 100085, P. R. China
4. School of Environmental Science and Engineering, Shanghai Jiao Tong University, 200240 Shanghai, China