1. Key Laboratory of Preservation of Human Genetic Resources and Disease Control in China (Harbin Medical University), Ministry of Education, Harbin 150081, China
2. Laboratory of Medical Genetics, Harbin Medical University, Harbin 150081, China
3. Department of Gastroenterology, The First Affiliated Hospital, Harbin Medical University, Harbin 150001, China
4. Infectious Disease Hospital of Heilongjiang Province, Harbin 150500, China