1. Scottish National Blood Transfusion Service, Edinburgh, United Kingdom
2. Department of Biological and Biomedical Sciences, School of Health and Life Sciences, Glasgow Caledonian University, Glasgow, United Kingdom
3. Department of Public Health, Glasgow University, Glasgow, United Kingdom
4. Health Protection Scotland, National Services Scotland, Glasgow, United Kingdom
5. Department of Hepatology, Division of Health Sciences, Edinburgh Medical School, Edinburgh, United Kingdom
6. Scottish Liver Transplantation Unit, Royal Infirmary, Edinburgh, United Kingdom
7. Department of Laboratory Medicine, NHS Lothian, Edinburgh, United Kingdom
8. Royal Cornwall Hospital and European Centre for Environment and Human Health, University of Exeter Medical School, Truro, United Kingdom