Systematic review Phase 3 — Literature search, string construction, database translation, deduplication, and PRISMA-S compliance for EM/critical care SRs. Use when the user needs to build, test, or refine search strings, select databases, deduplicate results, or document the search process. Trigger on "search string", "PubMed", "EMBASE", "database", "deduplicate", "search strategy", "PRISMA-S", "MeSH", "Boolean", "literature search", "hit count". Use ONLY when executing or documenting the literature search.
