[1] Univ Turin, Sez Farmacol & Tossicol, Dipartimento Patol Anim, I-10095 Grugliasco, TO, Italy
[2] Univ Padua, Sez Farmacol & Tossicol, Dipartimento Sanita Pubbl Patol Comparata & Igien, I-35100 Padua, Italy
[3] INRA, Lab Pharmacol Toxicol, F-31931 Toulouse, France