Pfizer, Inc., Groton, Connecticut 06340, USA Merck Research Laboratories, West Point, Pennsylvania 19586 USA Pathology Branch, Center for Food Safety and Applied Nutrition, FDA, College Park, Maryland 20740, USA U.S. Environmental Protection Agency, Research Triangle Park, North Carolina 27711, USA Charles River Laboratories, Senneville, Quebec H9X 3R3, Canada Merck and Company, Inc., West Point, Pennsylvania 19486, USA Wyeth Research, Chazy, New York 12921 USA Health Canada Ottawa, Ontario K1A 0L2, Canada Sanofi-Aventis, Porcheville 78440, France Vet Path Services, Inc., Cincinnati, Ohio 45249, USA Albert Einstein College of Medicine Bronx, New York 10461, USA Purdue University, West Lafeyette, Indiana 47907, USA
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Morton et al. (2006) studied this question.
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