[1] University of Copenhagen,Department of Veterinary and Animal Sciences, Research Group for Veterinary Parasitology
[2] University of Copenhagen,Department of Veterinary and Animal Sciences, Section for Animal Welfare and Disease Control
[3] Technical University of Denmark,National Veterinary Institute
[4] SEGES,Section for Parasitology
[5] Landbrug & Fødevarer F.m.b.A,undefined
[6] Norwegian Veterinary Institute,undefined