1. Division of Biotherapeutics, National Institute for Biological Standards and Control (NIBSC), South Mimms, Potters Bar, Hertfordshire, UK
2. Division of Technology Development and Infrastructure, National Institute for Biological Standards and Control, South Mimms, UK
3. Department of Biological Standardisation, OMCL Network & HealthCare (DBO), European Directorate for the Quality of Medicines and HealthCare (EDQM), Strasbourg, France