School of Public Health, College of Public Health, Taipei Medical University, 250 Wu-Hsing Street, Taipei, Taiwan. The Ph.D. Program for Translational Medicine, College of Medical Science and Technology, Taipei Medical University, Taipei, Taiwan. Colorectal Section, Department of Surgery, Chang Gung Memorial Hospital, Taoyuan, Taiwan. School of Medicine, Chang Gung University, Taoyuan, Taiwan. Department of Nutrition and Health Sciences, Chang Gung University of Science and Technology, Taoyuan, Taiwan. Research Center for Chinese Herbal Medicine, College of Human Ecology, Chang Gung University of Science and Technology, Taoyuan, Taiwan. Department of Public Health, College of Medicine, Chang Gung University, Taoyuan, Taiwan. Institute of Population Health Sciences, National Health Research Institutes, Miaoli, Taiwan. School of Public Health, College of Public Health, Taipei Medical University, 250 Wu-Hsing Street, Taipei, Taiwan. ccyeh@tmu.edu.tw. Department of Public Health, China Medical University, Taichung, Taiwan. ccyeh@tmu.edu.tw. Cancer Center, Wan Fang Hospital, Taipei Medical University, Taipei, Taiwan. ccyeh@tmu.edu.tw. Master Program in Applied Molecular Epidemiology, College of Public Health, Taipei Medical University, Taipei, Taiwan. ccyeh@tmu.edu.tw.