1. Division of Cardiovascular, Department of Surgery, Chi Mei Medical Center, Tainan 710, Taiwan, R.O.C.
2. Department of Neurology and Medical Intensive Care Unit, Chunghua Christian Hospital, Chunghua 505, Taiwan, R.O.C.
3. Institute of Biochemistry, Microbiology and Immunology, Chung Shan Medical University Hospital, Taichung 402, Taiwan, R.O.C.