1. Department of Internal Medicine, National Taiwan University Hospital, Taipei, Taiwan
2. Graduate Institute of Clinical Medicine, Medical College, National Taiwan University, Taipei, Taiwan
3. Institute of Statistical Science, Academia Sinica, Taipei, Taiwan
4. Department of Neurology, National Taiwan University Hospital, Taipei, Taiwan
5. Department of Surgery, National Taiwan University Hospital, Taipei, Taiwan
6. Department of Anesthesiology, National Taiwan University Hospital, Taipei, Taiwan