1. Department of Veterinary Clinical Sciences, Small Animal Clinic; Justus-Liebig University Giessen; Giessen; Germany
2. Institute of Parasitology; Justus-Liebig University Giessen; Giessen; Germany
3. Clinic for Small Animals Stommeln; Pulheim-Stommeln; Germany
4. Department of Parasitology, Parasite Diagnostics Unit; Institute of Tropical Medicine; Antwerp; Belgium