1. Department of Statistics and Informatics Science; Providence University; Taichung 43301 Taiwan Republic of China
2. Department of Financial and Computational Mathematics; Providence University; Taichung 43301 Taiwan Republic of China
3. Division of Nephrology; Department of Internal Medicine, Taichung Veterans General Hospital; Taichung 40705 Taiwan Republic of China
4. Department of Statistics; Tunghai University; Taichung 40704 Taiwan Republic of China