1. , Laboratory of Toxicology, Faculty of Veterinary Medicine, Univerisitat Autònoma de Barcelona, Bellaterra, Spain, and Patuxent Wildlife Research Center, U.S. Geological Survey, Laurel, Maryland, USA
2. , Patuxent Wildlife Research Center, U.S. Geological Survey, Laurel, Maryland, USA
3. , Department of Animal Medicine and Surgery, Faculty of Veterinary Medicine, Universitat Autònoma de Barcelona, Bellaterra, Spain