1. 1Department of Medical Oncology, National Taiwan University Hospital, Cancer Center Branch, Taipei, Taiwan.
2. 2Department of Internal Medicine, National Taiwan University Hospital, Taipei, Taiwan.
3. 3Department of Environmental, Agricultural and Occupational Health, University of Nebraska Medical Center, Omaha, Nebraska.
4. 4Department of Surgery, National Taiwan University Hospital, Taipei, Taiwan.
5. 5Graduate Institute of Clinical Medicine and School of Nursing, College of Medicine, National Taiwan University, Taipei, Taiwan.
6. 6Statistical Consulting Clinic, International-Harvard Statistical Consulting Company, Taipei, Taiwan.
7. 7Graduate Institute of Oncology, National Taiwan University, Taipei, Taiwan.
8. 8Department of Biology, Briar Cliff University, Sioux City, Iowa.