1. Business Economics Group Wageningen University Wageningen The Netherlands
2. College of Veterinary Medicine and Agriculture Addis Ababa University Addis Ababa Ethiopia
3. Center for Outcome Research and Epidemiology Department of Diagnostic Medicine and Pathobiology College of Veterinary Medicine Kansas State University Manhattan KS USA
4. Centre for Veterinary Epidemiological Research Atlantic Veterinary College University of Prince Edward Island Charlottetown PE Canada
5. Department Farm Animal Health Faculty of Veterinary Medicine Utrecht University Utrecht The Netherlands