1. Ecology and Evolutionary Biology Section School of Biological Sciences Reading University Whiteknights Reading RG6 6AS U.K
2. Institut für Rechtsmedizin Goethe University Frankfurt am Main 60596 Germany
3. Institut de Recherche Criminelle de la Gendarmerie Nationale Department Faune – Flore – Forensiques Pontoise 95000 France
4. Department of Microbiology National Veterinary Institute SVA Uppsala 751 89 Sweden