1. Cancer Science Institute of Singapore, National University of Singapore, Singapore 117599, Singapore.
2. Department of Pharmacology, Yong Loo Lin School of Medicine, National University of Singapore, Singapore 117599, Singapore.
3. Division of Oral Biology and Medicine and Division of Advanced Prosthodontics, University of California, Los Angeles (UCLA) School of Dentistry, Los Angeles, CA 90095, USA.
4. The Jane and Jerry Weintraub Center for Reconstructive Biotechnology, UCLA, Los Angeles, CA 90095, USA.
5. California NanoSystems Institute, UCLA, Los Angeles, CA 90095, USA.
6. Jonsson Comprehensive Cancer Center, UCLA, Los Angeles, CA 90095, USA.
7. Department of Bioengineering, The Henry Samueli School of Engineering and Applied Science, UCLA, Los Angeles, CA 90095, USA.