1. Department of Pharmaceutics, UCL School of Pharmacy, 29-39 Brunswick Square, London WC1N 1AX, United Kingdom
2. Discipline of Pharmaceutical Technology, School of Pharmaceutical Sciences, Universiti Sains Malaysia, 11800 Minden, Penang, Malaysia
3. Asylum Research, Oxford Instruments Company, Halifax Road, HP12 3SE High Wycombe, United Kingdom