1. Department of Epidemiology and Biostatistics Faculty of Public Heath Health Sciences Centre Kuwait University Kuwait City 13110 Kuwait
2. School of Natural Sciences University of Tasmania Hobart Tasmania 7001 Australia
3. Department of Veterinary Population Medicine College of Veterinary Medicine University of Minnesota St. Paul Minnesota 55108 USA
4. VISAVET Health Surveillance Centre and Animal Health Department Veterinary School Complutense University of Madrid Madrid 28040 Spain