1. Department of Statistics and Informatics Science, Providence University, Taichung, Taiwan, R.O.C
2. Department of Financial and Computational Mathematics, Providence University, Taichung, Taiwan, R.O.C
3. Department of International Trade, Kun Shan University, Tainan, Taiwan, R.O.C
4. Division of Nephrology, Department of Internal Medicine, Taichung Veterans General Hospital, Taichung, Taiwan, R.O.C