1. Department of Environmental Health, Institute for Preventive Medicine and Public Health, Hanoi Medical University, Hanoi, Vietnam
2. Department of International Health, Immunology and Microbiology, University of Copenhagen, Copenhagen, Denmark
3. Department of Biostatistics and Medical Informatics, Institute for Preventive Medicine and Public Health, Hanoi Medical University, Hanoi, Vietnam
4. Department of Veterinary Disease Biology, University of Copenhagen, Copenhagen, Denmark