1. Department of Internal Medicine, Division of Chest Medicine, Taichung Veterans General Hospital, Taichung 407, Taiwan
2. Department of Medical Laboratory Science and Biotechnology, Central Taiwan University of Science and Technology, Taichung 406, Taiwan
3. Department of Medical Technology of Medicine, Nursing and Management, Miaoli 350, Taiwan
4. Department of Pathology & Laboratory Medicine, Taichung Veterans General Hospital, Taichung 407, Taiwan