Department of Hospital Infection Control the First Affiliated Hospital of Zhejiang Chinese Medical University Hangzhou 310006 China;
Microbiology Laboratory the First Affiliated Hospital of Zhejiang Chinese Medical University Hangzhou 310001 China;
Clinical Evaluation and Analysis Center the First Affiliated Hospital of Zhejiang Chinese Medical University Hangzhou 310001 China;
Department of Epidemiology and Health Statistics School of Public Health Zhejiang University Hangzhou 310058 China;
Department of Gastroenterology the First Affiliated Hospital of Zhejiang Chinese Medical University Hangzhou 310001 China;