1. Biologische Bundesanstalt für Land- und Forstwirtschaft, Institut fü Pflanzenvirologie, Mikrobiologie und biologische Sicherheit, Messeweg 11–12, D-38104 Braunschweig, , Germany1
2. University of Ghent, , Belgium2
3. University of Essex, , UK4
4. GBF, Braunschweig, , Germany3
5. FAL, Braunschweig, , Germany5
6. NERC-Institute of Virology and Environmental Microbiology, Oxford, <, UK6
7. University of Birmingham, , UK7
8. University of York, , UK8
9. University of Athens, , Greece9
10. IPO-DLO, Wageningen, , The Netherlands10
11. University of Bergen, , Norway11
12. University of Milano, , Italy12
13. Technical University Berlin, , Germany13
14. School of Biology Georgia, Atlanta, , USA14