1. Department of Statistics, National Cheng Kung University, Tainan, Taiwan
2. School of Mathematics and Statistics, Xiamen University of Technology, Xiamen, People's Republic of China
3. The Center for Quantitative Sciences, Clinical Medicine Research Center, National Cheng Kung University Hospital, Tainan, Taiwan
4. Department of Biostatistics, School of Public Health, University of Michigan, Ann Arbor, MI, USA
5. Institute of Clinical Pharmacy and Pharmaceutical Sciences, Department of Pharmacy, College of Medicine, National Cheng Kung University, Tainan, Taiwan