1. Biotherapeutics groupNational Institute for Biological Standards and Control (NIBSC) Blanche Lane, South Mimms, Potters Bar, Hertfordshire, EN6 3QG UK
2. Biosystems and Biomaterials DivisionNational Institute of Standards and Technology (NIST) Gaithersburg Maryland 20899 United States of America
3. Division of Medical Physics and Metrological Information TechnologyPhysikalisch‐Technische Bundesanstalt (PTB) Berlin, 10587 Germany
4. BiostatisticsNational Institute for Biological Standards and Control (NIBSC) Blanche Lane, South Mimms, Potters Bar, Hertfordshire, EN6 3QG UK
5. Center of LengthKorea Research Institute of Standards and Science (KRISS) Daejeon Korea
6. TUBITAK UME (National Metrology Institute of Turkey) Gebze Turkey
7. Department of Transfusion Medicine, Staedtisches Klinikum KarlsruheAcademic Hospital of the University of Freiburg Freiburg Germany
8. Becton Dickinson, BD Life Sciences Tullastrasse 8‐12, 69126, Heidelberg Germany
9. Protein and Cell Analysis, Thermo Fisher Scientific Waltham Massachusetts USA
10. UK Stem Cell Bank UK
11. Istituto Nazionale di Ricerca Metrologica (INRIM) Torino TO Italy
12. Health Science & Innovation. LGC Ltd. Queens Road Teddington, Middlesex, TN11 0LY UK
13. National Institute of Metrology (NIM) Beijing Shi China