Mr. Stephen Lister BSc BVetMed CertPMP DiplECPVS MRCVS EBVS® European Specialist in Poultry Veterinary Science Member of European College of Poultry Veterinary Science salister@crowshall.co.uk Crowshall Veterinary Services 1 Crows Hall Lane Attleborough, Norfolk NR17 1AD United Kingdom