1. Bureau of Nutritional Sciences, Health and Welfare Canada, Ottawa, Ontario, Canada K1A OL2
2. Centre de Recherche en Nutrition, Université Laval, Ste-Foy, Québec, Canada G1K 7P4
3. Bureau of Chemical Safety, Food Directorate, Health Protection Branch, Health and Welfare Canada, Ottawa, Ontario, Canada K1A OL2
4. Animal and Poultry Science Department, University of Guelph, Guelph, Ontario, Canada N1G 2W1