1. Laboratory of Virology, Wageningen University and Research, Droevendaalsesteeg 1, 6708 PB Wageningen, the Netherlands
2. Summerland Research and Development Centre, Agriculture and Agri-Food Canada, 4200 Highway #97, Summerland, BC, Canada
3. Saskatoon Research and Development Centre, Agriculture and Agri-Food Canada, Saskatoon, SK, S7N 0X2, Canada