Department of Statistics, School of Mathematics and Statistics & Hubei Key Laboratory of Mathematical Sciences, Central China Normal University, Wuhan, China.|Department of Electronic Engineering, Guangdong Key Laboratory of Intelligent Information Processing and Shenzhen Key Laboratory of Media Security, Shenzhen University, Shenzhen, China.|Department of Respiratory Medicine, Wuhan Number 1 Hospital, Wuhan, China.|Department of Information Science, College of Computing and Informatics, Drexel University, Philadelphia, USA.|Department of Electronic Engineering, City University of Hong Kong, Hong Kong, China.