Nested case control study to analyze suspected cases and their related factors of allargic reactions to parenterally administered Dengzhan Xixin Analysis of questionably allergic factors to parenterally administered Shenmai——a nested case control study using hospital information system data Analysis of questionable allergic factors to parenterally administered salvianolate——a nested case control study using hospital information system data Analysis suspected allergic factors to Shenqi Fuzheng injection based on prescription sequence analysis and nested case control study Analysis of questionable allergic factors to Kudiezi injection——nested case control study using hospital information system data Shuxuetong injection-based on nested case-control study of blood through injection suspect allergic reaction influencing factors