1. a Ontario Ministry of Agriculture and Food, Agricultural and Food Laboratory Services Branch, P.O. Box 3650, 95 Stone Road West, Guelph, Ontario, Canada, N1H 8J7
2. b Centre For Toxicology, 620 Gordon Street, Guelph, Ontario, Canada, N1G 1Y4
3. c Department of Environmental Biology, University of Guelph, Guelph, Ontario, Canada, N1G 2W1