1. Institute of Reproductive and Developmental Biology, Dept. of Surgery and Cancer, Faculty of Medicine, Imperial College London, London, UK
2. Department of Clinical Chemistry, Karolinska University Hospital Huddinge, Stockholm, Sweden
3. UCL Institute of Liver and Digestive Health, Royal Free Hospital Campus University College Medical School, London, UK
4. North Hampshire Hospital National Health Service Trust, Basingstoke, Hampshire, UK
5. Institute of Medicine, Department of Internal Medicine, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden