Annette H Kampen*, Petter Hopp, Gry M Grøneng, Ingrid Melkild, Anne M Urdahl, Ann-Charlotte Karlsson and Jorun Tharaldsen
* Corresponding author: Annette H Kampen Annette.Kampen@vetinst.no
BMC Veterinary Research 2012, 8:59 doi:10.1186/1746-6148-8-59
