1. Fujian Provincial Key Laboratory of Innovative Drug Target Research and State Key Laboratory of Cellular Stress Biology; School of Pharmaceutical Sciences; Xiamen University; Xiamen 361102 P. R. China
2. Department of Chemical & Bimolecular Engineering; National University of Singapore; 4 Engineering Drive 4 Singapore 117585 Singapore
3. Institute of Materials Research and Engineering; A*STAR (Agency for Science, Technology and Research); 2 Fusionopolis Way, Innovis, #08-03 Singapore 138634 Singapore
4. Department of Materials Science and Engineering; National University of Singapore; 9 Engineering Drive 1 Singapore 117576 Singapore
5. Singapore Eye Research Institute; 11 Third Hospital Avenue Singapore 168751 Singapore