1. Veterinary Epidemiology, Economics and Public Health Group, Department of Pathobiology and Population Sciences, Royal Veterinary College, Hatfield, United Kingdom
2. Department of Global Health and Development, London School of Hygiene and Tropical Medicine, London, United Kingdom
3. School of Veterinary Medicine, City University of Hong Kong, Kowloon, Hong Kong
4. Department of Infectious Disease Epidemiology, London School of Hygiene and Tropical Medicine, London, United Kingdom