1. Department of Statistics, College of Economics, Jinan University, Guangzhou, China
2. School of Mathematical Sciences, Queensland University of Technology, Brisbane, Queensland, Australia
3. School of Mathematics and Statistics, Xi’an Jiaotong University, Shaanxi, China
4. Department of Statistical Science, School of Mathematics and Computational Science, Sun Yat-Sen University, Guangzhou, China
5. Zhongshan School of Medicine, Sun Yat-Sen University, Guangzhou, China
6. Xinhua College, Sun Yat-Sen University, Guangzhou, China