Systematic Reviews
ScribeLabWriter develops reproducible, multi-database search strategies built to PRESS standards (McGowan et al., Journal of Clinical Epidemiology, 2016) and reported according to PRISMA-S (Rethlefsen et al., Systematic Reviews, 2021). Every strategy is constructed by a methodologist with systematic review publication experience who understands both the controlled vocabulary systems (MeSH for PubMed/MEDLINE, Emtree for Embase) and the database-specific syntax requirements that differ across platforms.
We deliver the search strategy as a complete, exportable documentation package with the exact syntax used in each database, the date each search was executed, the number of records retrieved, and the deduplication count.
The PRESS guideline (Peer Review of Electronic Search Strategies, McGowan et al., 2016) identifies six elements that should be evaluated in every systematic review search:
1. Translation of the research question. Every PICO or PCC component must be represented in the search with appropriate terms. Missing a population qualifier or an outcome term produces a search that does not match the review question.
2. Boolean and proximity operators. AND narrows the search by requiring all concept blocks to be present. OR broadens within a concept block by accepting synonyms. NOT excludes terms but must be used cautiously because it can remove relevant records. Proximity operators (NEAR, ADJ in Ovid; W/n in Embase) find terms within a specified distance, which is useful for multi-word concepts.
3. Subject headings. MeSH terms in PubMed/MEDLINE and Emtree terms in Embase are controlled vocabulary that standardize how concepts are indexed. Searching with subject headings captures studies that used different natural-language terms for the same concept. Exploding a subject heading includes all narrower terms beneath it in the hierarchy.
4. Text-word searching. Free-text terms in titles and abstracts capture studies that have not yet been indexed or that use terminology the controlled vocabulary does not cover. Truncation (e.g., nurs* captures nurse, nurses, nursing) and wildcards expand the reach.
5. Spelling, syntax, and line numbers. Database-specific syntax errors (incorrect field tags, misplaced parentheses, wrong truncation symbols) produce inaccurate results that are difficult to detect without peer review.
6. Limits and filters. Date limits, language restrictions, and validated search filters (such as the Cochrane Highly Sensitive Search Strategy for RCTs) must be appropriate to the review question and declared transparently.
We select databases based on your discipline, research question, and review type. The minimum for most systematic reviews is three databases. We commonly search across the following:
| Database | Coverage | Controlled Vocabulary | Best For |
|---|---|---|---|
| PubMed / MEDLINE | Biomedical and life sciences | MeSH | Clinical interventions, public health, nursing |
| Embase | Biomedical, pharmacological | Emtree | Drug studies, European research, pharmacology |
| Cochrane CENTRAL | Controlled trials register | MeSH (via MEDLINE records) | RCTs, clinical trials for intervention reviews |
| CINAHL Complete | Nursing, allied health | CINAHL Subject Headings | Nursing research, midwifery, physiotherapy |
| PsycINFO | Psychology, behavioral science | APA Thesaurus | Mental health, psychology, behavioral interventions |
| Scopus | Multidisciplinary | None (text-word only) | Cross-disciplinary reviews, citation tracking |
| Web of Science | Multidisciplinary | None (text-word only) | Cross-disciplinary reviews, citation tracking, conference proceedings |
We also search grey literature sources when your protocol requires them: Google Scholar, OpenGrey, clinical trial registries (ClinicalTrials.gov, WHO ICTRP), thesis repositories, conference proceedings, and organizational reports.
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| Tier | Timeline | Best For |
|---|---|---|
| Standard | 5 to 10 days | Reviews in the planning stage with time before screening begins |
| Priority | 3 to 5 days | Reviews that need to begin screening soon |
| Express | 1 to 2 days | Urgent protocol completions, reviewer-requested search updates |
Most journals and the Cochrane Handbook require a minimum of three databases. The specific databases depend on your discipline and research question. A nursing review might search PubMed, CINAHL, and Cochrane CENTRAL. A psychology review might search PubMed, PsycINFO, and Scopus. We recommend the appropriate databases based on your PICO question and discipline.
PRESS (Peer Review of Electronic Search Strategies) is a guideline published by McGowan et al. in the Journal of Clinical Epidemiology (2016) that provides a standardized checklist for evaluating systematic review search strategies. It covers six elements: translation of the research question, Boolean operators, subject headings, text-word terms, syntax accuracy, and limits. Having a PRESS-reviewed search strengthens the methodological credibility of your review and reduces the risk of reviewer criticism.
Yes. If your review is at the revision stage and a reviewer has requested an updated search, additional databases, or modified search terms, we can update your existing strategy and re-execute it. We document the update with the new search dates and record counts.
Yes, when your protocol requires it. Grey literature sources include Google Scholar, OpenGrey, ClinicalTrials.gov, WHO ICTRP, conference proceedings, and organizational reports. Grey literature searching is recommended by the Cochrane Handbook to reduce publication bias.
Yes. The search strategy is available as a standalone service for researchers who want to conduct the screening and extraction themselves but need expert support building the search. Many academic librarians also use this service to complement their own search development.
We export the retrieved references in a format compatible with your reference manager: RIS (for EndNote, Zotero, Mendeley), BibTeX, or CSV. We also provide the raw database export files for reproducibility documentation.
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