1. School of Public Health, University of Nevada, Reno, 1664 N. Virginia Street, Reno, Nevada 89557-0274, USA
2. College of Environmental Sciences and Engineering, Peking University, Beijing 100871, China
3. NILU-Norwegian Institute for Air Research, P. O. Box 100, Kjeller NO-2027, Norway
4. Department of Chemistry, University of Oslo, P. O. Box 1033, Oslo NO-0315, Norway
5. International Joint Research Center for Persistent Toxic Substances (IJRC-PTS), State Key Laboratory of Urban Water Resource and Environment, School of Environment, Harbin Institute of Technology, Harbin 150090, China
6. IJRC-PTS-NA, Toronto, Ontario M2N 6X9, Canada