1. National Measurement Laboratory, LGC, Teddington, Middlesex, United Kingdom
2. Department of Microbiology, Virology and Infection Control, Great Ormond Street Hospital for Children NHS Foundation Trust, London, United Kingdom
3. Clinical Research Department, London School of Hygiene & Tropical Medicine, London, United Kingdom
4. Centre for Clinical Microbiology, Royal Free Campus, Division of Infection and Immunity, Faculty of Medical Sciences, University College London, London, United Kingdom
5. Virology Department, ESEL Pathology Partnership, Royal London Hospital, Barts Health NHS Trust, London, United Kingdom
6. Royal Free Hospital NHS Foundation Trust, London, United Kingdom
7. Clover Bioanalytical Software, Granada, Spain
8. School of Biosciences & Medicine, Faculty of Health & Medical Science, University of Surrey, Guildford, United Kingdom