1. Department of Pediatrics, Chung Shan Medical University Hospital, Taichung 402, Taiwan
2. School of Medicine, Chung Shan Medical University, Taichung 402, Taiwan
3. Institute of Medicine, Chung Shan Medical University, Taichung 402, Taiwan
4. Department of Medical Research, Chung Shan Medical University Hospital, Taichung 402, Taiwan
5. Department of Clinical Pathology, Chung Shan Medical University Hospital, Taichung 402, Taiwan