1. Institute of Clinical Medicine, College of Medicine, National Cheng Kung University, No. 138, Sheng Li Road, Tainan 704, Taiwan
2. Department of Medical Biochemistry, College of Medicine and Health Science, University of Gondar, Gondar, Ethiopia
3. Departments of Oncology and Internal Medicine, National Cheng Kung University Hospital, College of Medicine, National Cheng Kung University, Tainan 704, Taiwan