1. Department of Wildlife, Fish, and Environmental Studies, Swedish University of Agricultural Sciences, Umeå, Sweden.
2. Department of Virology, Swedish Institute for Infectious Disease Control, Solna, Sweden.
3. Evolutionary Ecology Group, Department of Biology, University of Antwerp, Antwerp, Belgium.
4. Danish Pest Infestation Laboratory, Department of Integrated Pest Management, Faculty of Agricultural Sciences, University of Aarhus, Kongens Lyngby, Denmark.
5. Vantaa Research Unit, The Finnish Forest Research Institute, Vantaa, Finland.