1. Department of Pharmacy; Faculty of Medicine; University of Malaya; 50603 Kuala Lumpur Malaysia
2. Department of Chemical Engineering; National Taiwan University of Science and Technology; 43 Section 4, Keelung Road Taipei 10607 Taiwan
3. Department of Pharmacology; Faculty of Medicine; University of Malaya; 50603 Kuala Lumpur Malaysia
4. Graduate Institute of Applied Science and Technology; National Taiwan University of Science and Technology; 43 Section 4, Keelung Road Taipei 10607 Taiwan
5. Department of Materials Science and Chemistry; University of Hyogo; 2167 Shosha Himeji Hyogo 671-2280 Japan