1. Department of Veterinary Anatomy; Glasgow Veterinary School; Bearsden Road Glasgow G61 1QH
2. Allergy Department; Hospital Santiago Apóstol; C/ Olaguibel 29 01004 Vitoria-Gasteiz Pais Vasco Spain
3. Division of Infection and Immunity; Institute of Biomedical and Life Sciences, Joseph Black Building; University of Glasgow; Glasgow G12 8QQ