Affiliation: | Science College, Air Force Engineering University, 710051 Xi''an, PR China,Science College, Air Force Engineering University, 710051 Xi''an, China;College of Mathematics and Information Science, Shaanxi Normal University, 710062, Xi''an, China; Centre for Disease Modelling, York University, M3J 1P3, Toronto, Canada,Department of Applied Mathematics, Xi''an Jiaotong University, 710049 Xi''an, China and School of Biomedical Engineering, the Fourth Military Medical University, 710032 Xian, China |