1. School of Computer Science and Engineering, Nanjing University of Science and Technology, 200 Xiaolingwei, Nanjing 210094, China
2. Computer Department, Jingdezhen Ceramic University, Jingdezhen 333403, China
3. Department of Computational Medicine and Bioinformatics, University of Michigan, 100 Washtenaw, Ann Arbor, Michigan 48109-2218, United States