1. Clinical Research Center, The Affiliated Hospital of Guangdong Medical University, Zhanjiang, Peoples Republic of China
2. Nutritional Department, The Affiliated Hospital of Guangdong Medical University, Zhanjiang, Peoples Republic of China
3. Department of Epidemiology and Health Statistics, School of Public Health, Guangdong Medical University, Zhanjiang, Peoples Republic of China
4. Department of Radiotherapy, The Seventh Peoples Hospital of Chengdu, The Oncology Hospital of Chengdu, Chengdu, Peoples Republic of China
5. Department of Hepatobiliary Surgery, The First Peoples Hospital of Yunnan Province, Kunming, Peoples Republic of China
6. School of Public Health, Guangdong Medical University, Zhanjiang, Peoples Republic of China