1. Department of Microbiology, Harbin Medical University, Harbin 150086, Heilongjiang, China
2. Wu Lien-Teh Institute, Harbin Medical University, Harbin 150086, Heilongjiang, China
3. Department of Nutrition and Food Hygiene, Public Health College, Harbin Medical University, Harbin 150086, Heilongjiang, China
4. The Affiliated Tumor Hospital of Harbin Medical University, Harbin Medical University, Harbin 150086, Heilongjiang, China