[1] US EPA, Midcontinent Ecol Div, Natl Hlth & Environm Effects Res Lab, Off Res & Dev, Duluth, MN 55804 USA
[2] Norwegian Inst Water Res NIVA, Oslo, Norway
[3] Dow Corning Corp, Hlth & Environm Sci, Midland, MI 48640 USA
[4] Vrije Univ Amsterdam, Inst Environm Studies, Amsterdam, Netherlands
[5] Environm Canada, Water Sci & Technol Directorate, Aquat Contaminants Res Div, Burlington, ON L7R 4A6, Canada
[6] ExxonMobil Biomed Sci, Houston, TX 77002 USA