1. Program for Chemical and Environmental Toxicology, Department of Biology, University of Ottawa, P.O. Box 450, Station A, Ottawa, Ontario, Canada, K1N 6N5
2. Department of Biology, University of Ottawa, P.O. Box 450, Station A, Ottawa, Ontario, Canada, K1N 6N5
3. Environmental Health Program, Concordia University College of Alberta, 10537-44 Street, Edmonton, Alberta, Canada, T6A 1W1
4. Department of Biological Sciences, University of Alberta, CW 405 Biological Sciences Center, Edmonton, Alberta, Canada, T6G 2E9