Department of Veterinary Clinical Sciences, College of Veterinary Medicine, The Ohio State University, 601 Vernon L. Tharp Street, Columbus, Ohio 43210, USA (V Quam, Yardley, Belknap); Department of Public Health and Clinical Medicine, Faculty of Medicine, Umeå University, Umeå 901 87, Sweden (M Quam); Department of Veterinary Clinics and Surgery, College of Veterinary, Universidade Federal de Minas Gerais (UFMG), 6627 Av. Antônio Carlos, Belo Horizonte, Minas Gerais 31270-901 Brazil (Paz).