1. Institute of Veterinary Medicine and Animal Sciences, Estonian University of Life Sciences, Tartu, Estonia.
2. Department of Veterinary and Animal Sciences, University of Copenhagen, Copenhagen, Denmark.
3. Laboratory of Parasitology, Department of Bacteria, Parasites & Fungi, Infectious Disease Preparedness, Statens Serum Institut, Copenhagen, Denmark.
4. Faculty of Veterinary Medicine, University of Helsinki, Helsinki, Finland.