1. Department of Population Health and Pathobiology College of Veterinary Medicine North Carolina State University Raleigh North Carolina USA
2. Department of Epidemiology and Public Health Faculty of Veterinary, Animal and Biomedical Sciences Sylhet Agricultural University Sylhet Bangladesh
3. College of Veterinary Medicine University of Tennessee Knoxville Tennessee USA
4. Infectious Diseases Division International Centre for Diarrhoeal Disease Research, Bangladesh (icddr,b) Dhaka Bangladesh