1. School of Medicine, Kaohsiung Medical University, Kaohsiung 807, Taiwan
2. Department of Nursing, Kaohsiung Medical University Hospital, Kaohsiung 807, Taiwan
3. Statistical Analysis Laboratory, Department of Medical Research, Kaohsiung Medical University Hospital, Kaohsiung Medical University, Kaohsiung 807, Taiwan
4. Department of Business Management, National Sun Yat-Sen University, Kaohsiung 803, Taiwan
5. Administration Management Center, Kaohsiung Siaogang Municipal Hospital, Kaohsiung 812, Taiwan
6. School of Medicine, College of Medicine, Kaohsiung Medical University, Kaohsiung 807, Taiwan
7. Division of Endocrinology and Metabolism, Department of Internal Medicine, Kaohsiung Medical University Hospital, Kaohsiung 807, Taiwan
8. Department of Internal Medicine, Kaohsiung Medical University Gangshan Hospital, Kaohsiung 820, Taiwan