1. Cytokine and Growth Factor Section, Biotherapeutics Group, National Institute for Biological Standards and Control, Hertfordshire, United Kingdom.
2. Department of Neurology, Blizard Institute of Cell and Molecular Science, Barts and The London School of Medicine and Dentistry, Queen Mary University of London, London, United Kingdom.
3. Department of Pharmaceutical Sciences and Innovation Studies, Utrecht University, Utrecht, The Netherlands.