1. Department of Clinical Biochemistry and Immunology, Peterborough City Hospital, Peterborough, UK
2. Liverpool Clinical Laboratories, Blood Sciences Department, Aintree University Hospital, Liverpool, UK
3. Derriford Combined Laboratory, Plymouth Hospitals NHS Trust, Plymouth, Devon, UK
4. Becton Dickinson Diagnostics, Preanalytical Systems (PAS), Oxford, UK
5. Clinical Chemistry Department, New Cross Hospital, Wolverhampton, UK