1. Department of Bacteriology; Belfast City Hospital; Northern Ireland UK
2. School of Biomedical Sciences; University of Ulster; Northern Ireland UK
3. Department of Cardiology; The John Radcliffe Hospital; Oxford UK
4. Department of Oral and Maxillofacial Medicine and Surgery; University of Sheffield; Sheffield UK
5. School of Medicine, Dentistry and Biomedical Sciences; Queen's University; Northern Ireland UK