Institution: | 1. Department of Epidemiology and Health Statistics, School of Public Health, Shandong University, Jinan 250012, China 2. Institute for Infectious Disease Control and Prevention, Shandong Centre for Disease Control and Prevention, Jinan 250014, China 3. Department of Nosocomial Infection Management and Disease Control, Beijing Institute of Microbiology and Epidemiology,Beijing 100071, China |