1. Institute of Gerontology and Geriatrics, Chinese PLA General Hospital, Beijing 100853, People’s Republic of China
2. Institute for Lasers, Photonics and Biophotonics, University at Buffalo, The State University of New York, Buffalo, New York 14260-4200, United States
3. San Jose State University, San Jose, California 95192, United States
4. School of Electrical and Electronic Engineering, Nanyang Technological University, Nanyang Avenue, Singapore 639798, Singapore
5. Department of Chemical and Biological Engineering, University at Buffalo, The State University of New York, Buffalo, New York 14260-4200, United States
6. Department of Chemistry, Korea University, Seoul 136-701, Korea