1. Computer and Information College, Fujian Agriculture and Forestry University, Fuzhou, Fujian, CHINA
2. Key Laboratory of Fujian Universities for Ecology and Resource Statistics, Fuzhou, CHINA
3. Department of Computer Science, University of Idaho, Moscow, USA
4. Fuzhou Center for Disease Control and Prevention, Fuzhou, Fujian, CHINA
5. College of Mathematics and Informatics, Fujian Normal University, Fuzhou, Fujian, CHINA