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