1. School of Electronics and Information Engineering, Wuyi University, Jiangmen, China
2. Department of Biomedical Engineering, Key Laboratory for Biomedical Engineering of Ministry of Education of China, Zhejiang University, Hangzhou, Zhejiang, China
3. Faculty of Health Sciences and the Center for Cognitive and Brain Sciences, University of Macau, Taipa, Macau
4. Department of Biomedical Engineering, Shantou University, Shantou, China
5. School of Computer Science and Electronic Engineering, University of Essex, Colchester, U.K.