Division of Colorectal Surgery, Department of Surgery, Kaohsiung Medical University Hospital, Kaohsiung Medical University, Kaohsiung, Taiwan. Division of General and Digestive Surgery, Department of Surgery, Kaohsiung Medical University Hospital, Kaohsiung Medical University, Kaohsiung, Taiwan. Division of Colorectal Surgery, Department of Surgery, Chang Gung Memorial Hospital-Kaohsiung, Kaohsiung, Taiwan. Division of Nutrition and Dietetics, Kaohsiung Medical University Hospital, Kaohsiung Medical University, Kaohsiung, Taiwan. Division of Colon and Rectal Surgery, Department of Surgery, Chang Gung Memorial Hospital-Linkou, Taoyuan, Taiwan. Division of Colon & Rectal Surgery, Department of Surgery, Taipei Veterans General Hospital, Taipei, Taiwan. Division of Nutrition, Chang Gung Memorial Hospital-Linkou, Taoyuan, Taiwan. Division of Nutrition, Taichung Veterans General Hospital, Taichung, Taiwan. Division of Colorectal Surgery, Department of Surgery, Taichung Veterans General Hospital, Taichung, Taiwan. Department of Surgery, Faculty of Medicine, College of Medicine, Kaohsiung Medical University, Kaohsiung, Taiwan. Graduate Institute of Clinical Medicine, College of Medicine, Kaohsiung Medical University, Kaohsiung, Taiwan. Graduate Institute of Medicine, College of Medicine, Kaohsiung Medical University, Kaohsiung, Taiwan. Center for Cancer Research, Kaohsiung Medical University, Kaohsiung, Taiwan. Center for Liquid Biopsy and Cohort Research, Kaohsiung Medical University, Kaohsiung, Taiwan. Clinical Pharmacogenomics and Pharmacoproteinomics, College of Pharmacy, Taipei Medical University, Taipei, Taiwan. Pingtung Hospital, Ministry of Health and Welfare, Pingtung, Taiwan.