1. Division of Virology, Department of Infectious Diseases, St Jude Children's Research Hospital, Memphis, Tennessee, USA
2. IHAP, Université de Toulouse, INRA, ENVT, Toulouse, France
3. Department of Livestock and Fisheries, Ministry of Agriculture, Vientiane, Lao PDR, Laos
4. Department of Microbiology, State Key Laboratory of Emerging Infectious Diseases, University of Hong Kong, Hong Kong SAR