1. Department of Mathematics; South China University of Technology; Guangzhou 510640 China
2. Zhongshan Hospital; Fudan University; Shanghai 200031 China
3. Collaborative Research Center for Innovative Mathematical Modelling; Institute of Industrial Science, University of Tokyo; Tokyo 153-8505 Japan
4. Key Laboratory of Systems Biology; SIBS-Novo Nordisk Translational Research Centre for PreDiabetes; Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences; Shanghai 200031 China