1. Department of Biological and Environmental Science; University of Jyväskylä; PO Box 35 FI-40014 Jyväskylä Finland
2. Faculty of Veterinary Medicine; University of Helsinki; PO Box 66 FI-00014 Helsinki Finland
3. Department of Biology; University of Eastern Finland; PO Box 111 FI-80101 Joensuu Finland
4. Finnish Food Safety Authority Evira; Elektroniikkatie 3 90590 Oulu Finland
5. Natural Resources Institute Finland (Luke); Natural Resources and Bioproduction; Manamansalontie 90 88300 Paltamo Finland