Chun-Ju Chiang1, Ying-Wei Wang2, Wen-Chung Lee3. 1. Institute of Epidemiology and Preventive Medicine, College of Public Health, National Taiwan University, Taipei, Taiwan; Taiwan Cancer Registry, Taipei, Taiwan. 2. Health Promotion Administration, Ministry of Health and Welfare, Taipei, Taiwan. 3. Institute of Epidemiology and Preventive Medicine, College of Public Health, National Taiwan University, Taipei, Taiwan; Taiwan Cancer Registry, Taipei, Taiwan. Electronic address: wenchung@ntu.edu.tw.