1. Wuhan National Laboratory for Optoelectronics; Huazhong University of Science and Technology; Wuhan P. R. China
2. Key Laboratory of Biomedical Photonics of Ministry of Education; Huazhong University of Science and technology; Wuhan P. R. China
3. Department of Biomedical Engineering; Guangdong Medical University; Dongguan P. R. China