1. Department of Health Statistics, School of Preventive Medicine, Air Force Military Medical University, Xi’an, Shaanxi, China
2. Department of Statistics, Beijing Key Tech Statistical Consulting Co., Ltd, Beijing, China
3. Department of Immunization Planning, Center for Disease Control and Prevention of Changzhou City, Changzhou, Jiangsu, China
4. Department of Clinical Research, Sinovac Biotech, Beijing, China
5. Department of Statistics, Peking University Clinical Research Institute, Peking University Health Science Center, Beijing, China