1 Fujian Provincial Key Laboratory for Photonics Technology and Key Laboratory of Optoelectronic Science and Technology for Medicine, Ministry of Education, Fujian Normal University, Fuzhou 350007, China.
2 Institute of Bioengineering and Nanotechnology, 31 Biopolis Way, The Nanos, Singapore 138669.
3 The Fourth Military Medical University, Xi'an 710032, China.
4 Department of Physiology, Yong Loo Lin School of Medicine, National University of Singapore, Singapore 117597.
5 Lerner Research Institute, Cleveland, OH 44195, USA.