1. Department of Pharmacology and Pharmacy, Li Ka Shing Faculty of Medicine, The University of Hong Kong, L2-08B, Laboratory Block, 21 Sassoon Road Pokfulam, Hong Kong SAR, China
2. Department of Pharmacy, Faculty of Life Sciences & Medicine, King's College London, London, UK
3. Pharmaceutical Materials Science and Engineering Laboratory, Department of Pharmaceutics, College of Pharmacy, University of Minnesota, Minneapolis, Minnesota 55455, USA
4. Advanced Biomedical Instrumentation Centre, Hong Kong Science Park, Shatin, Hong Kong SAR, China