Adrian Muwonge*, Tone B Johansen, Edvardsen Vigdis, Jacques Godfroid, Francisco Olea-Popelka, Demelash Biffa, Eystein Skjerve and Berit Djønne
* Corresponding author: Adrian Muwonge adrian.muwonge@nvh.no
BMC Veterinary Research 2012, 8:168 doi:10.1186/1746-6148-8-168