1. Institute of Materials Research and Engineering (IMRE); 2 Fusionopolis Way, #08-03 Innovis Singapore 138634 Singapore
2. Department of Chemistry; Hong Kong Branch of Chinese National Engineering Research Center for Tissue Restoration and Reconstruction; The Hong Kong University of Science and Technology; Clear Water Bay Kowloon Hong Kong 999077 China
3. Fujian Provincial Key Laboratory of Innovative Drug Target Research; School of Pharmaceutical Sciences; Xiamen University; Xiamen Fujian 361102 P. R. China
4. Lee Kong Chian School of Medicine; Nanyang Technological University; Experimental Medicine Building Singapore 636921 Singapore
5. Singapore Eye Research Institute; 11 Third Hospital Avenue, The Academia 20 College Road Singapore 168751 Singapore
6. Department of Materials Science and Engineering; National University of Singapore; 9 Engineering Drive 1 Singapore 117576 Singapore