1. Department of Internal Medicine, Chi Mei Medical Center, Tainan 710, Taiwan, R.O.C.
2. Institute of Biochemistry, Microbiology and Immunology, Chung Shan Medical University, Taichung 402, Taiwan, R.O.C.
3. Surgical Department, Cardiovascular Division, China Medical University Hospital, Taichung 402, Taiwan, R.O.C.