1. Department of Surgery, Therapeutics and Toxicology, University of Wales College of Medicine, Cardiff, UK
2. Department of Gastroenterology, Therapeutics and Toxicology, University of Wales College of Medicine, Cardiff, UK
3. Department of Pathology, and Therapeutics and Toxicology, University of Wales College of Medicine, Cardiff, UK
4. Department of Pharmacology, Therapeutics and Toxicology, University of Wales College of Medicine, Cardiff, UK