Systematic Literature Review Service

A systematic literature review (SLR) represents the gold standard in evidence synthesis. It is a methodical, transparent, and replicable process designed to locate, evaluate, and synthesise all available research on a focused question. Unlike a traditional literature review, an SLR follows a rigorous, pre-defined protocol to minimise bias, making it the cornerstone of evidence-based practice in medicine, healthcare, public health, psychology, education, and the social sciences.

At Regent Writing, our team of UK-native PhD consultants possesses the advanced methodological expertise required to conduct or guide you through every phase of this demanding process. We don’t just write; we partner with you to build a robust, defensible, and publication-ready systematic review that can form the foundation of your research or contribute significantly to your field.

What is a Systematic Literature Review?

A systematic literature review is a research project about a research question. It is a secondary study that uses a rigorous and auditable methodology to answer a specific question by synthesising the results of multiple primary studies

The core pillars of any credible SLR are:

Transparency

Every decision, from the search strategy to the criteria for including studies, is documented and justified.

Clarity

The research question and methodology are stated in clear, unambiguous terms.

Replicability

Another researcher, following your documented steps, should be able to replicate your search and arrive at similar conclusions.

Exhaustiveness

The goal is to find and include all relevant research that meets your criteria, not just a convenient sample.

Many students and early-career researchers underestimate the sheer scale and precision required. Our service provides the expert scaffolding you need to navigate this complexity successfully, ensuring your review stands up to the scrutiny of supervisors, examiners, and journal peer-reviewers.

Our Comprehensive Systematic Review Process

We follow a structured, multi-stage process that aligns with the rigorous standards set forth by the Cochrane and Campbell Collaborations.

Formulating a Focused Research Question:

This is the most critical step. We work with you to develop a precise, answerable question, often structured around the PICO framework (or its variants like PICo, SPIDER) to ensure conceptual clarity and a targeted search.

Protocol Development & PROSPERO Registration:

We help you craft a detailed a priori protocol outlining your objectives, search strategy, inclusion/exclusion criteria, methods for quality appraisal, and data synthesis plan. We can then guide you through the process of registering this protocol on PROSPERO, the international prospective register of systematic reviews, lending your work immediate credibility and transparency.

Systematic Literature Search

Our experts design and execute a comprehensive, sensitive search strategy across the most relevant academic databases. This goes beyond a simple Google Scholar query. We will typically search:

For Medical/Health/Life Sciences: PubMed/MEDLINE, Embase, Cochrane Library, CINAHL (for nursing and allied health), PsycINFO (for psychology).
For Multidisciplinary Content: Web of Science Core Collection, Scopus, which index high-impact journals from all disciplines.
For Social Sciences & Education: ERIC (education), Sociological Abstracts, Social Sciences Citation Index (via Web of Science).
For Grey Literature: To minimise publication bias, we can also search sources for unpublished studies and conference proceedings, such as OpenGrey or ProQuest Dissertations & Theses Global.

Rigorous Screening and Selection

Using reference management software, we systematically screen titles, abstracts, and subsequently full texts against your pre-defined eligibility criteria. The entire process is meticulously documented to populate the PRISMA flow diagram.

In-Depth Quality and Risk of Bias Assessment

We critically appraise the methodological quality of each included study. We use established, validated tools appropriate to the study design, such as:

Cochrane Risk of Bias (RoB 2) tool for randomised controlled trials.
ROBINS-I (Risk Of Bias In Non-randomised Studies – of Interventions).
QUADAS-2 for diagnostic accuracy studies.
AMSTAR-2 for reviews of reviews.
CASP checklists for various study types.

Systematic Data Extraction

We develop and pilot a data extraction form to consistently capture key information from each included study (e.g., study characteristics, population, intervention details, outcomes, and findings).

Synthesis of Results

We synthesise the extracted data using the most appropriate method. This may involve a narrative synthesis (summarising and explaining findings textually) or, if the data is sufficiently homogeneous and you require it, a meta-analysis to statistically pool the results.

PRISMA-Compliant Reporting

We structure your final manuscript according to the latest PRISMA (Preferred Reporting Items for Systematic Reviews and Meta-Analyses) 2020 guidelines. This includes a clear abstract, introduction, methods section, results section (featuring the PRISMA flow diagram and summary tables), discussion, and conclusion all written to a standard suitable for submission to a peer-reviewed journal.

Key Methodological Frameworks in Detail

Our writers are not just familiar with these concepts; they are experts in their practical application.

Mastering the PICO Framework

A well-built clinical or research question is the foundation of an effective search. We use PICO to deconstruct your initial idea into its core elements:

Population/Problem: e.g., “In adults with chronic lower back pain…”
Intervention: e.g., “…does a structured yoga programme…”
Comparison: e.g., “…compared to conventional physiotherapy…”
Outcome: e.g., “…lead to a greater reduction in pain intensity and improvement in functional mobility?”

For qualitative reviews, we might use PICo (Population, phenomenon of Interest, Context), and for more complex questions, frameworks like SPIDER (Sample, Phenomenon of Interest, Design, Evaluation, Research type) can be employed.

The Importance of PRISMA

PRISMA is more than just a reporting checklist; it’s a roadmap for a high-quality systematic review. Using the PRISMA 2020 statement ensures that your review includes all the essential components that editors, reviewers, and readers expect.

Our commitment to PRISMA guarantees:

A Transparent Methods Section: We clearly document your search dates, databases searched, and search strings.
A Complete Results Section: We present the results of your search and selection process in the standardised PRISMA flow diagram.
Synthesis of Results: We transparently present the characteristics and results of the included studies, along with the findings of your quality assessment.

Databases We Use for Comprehensive Searching

The strength of any systematic review lies in the breadth and depth of its literature search. We have expert-level access to and experience with the full range of academic databases. Depending on your field, our search strategy will typically include combinations of:

Core Biomedical & Health Databases

PubMed / MEDLINE: The premier database for biomedical literature.
Embase: Strong for pharmaceutical and drug research, with unique indexing not found in MEDLINE.
Cochrane Library: The gold standard for systematic reviews and controlled trials.
CINAHL Plus: The authoritative resource for nursing and allied health professionals.

Multidisciplinary & High-Impact Databases

Web of Science (Core Collection): Covers sciences, social sciences, arts, and humanities.
Scopus: The largest abstract and citation database of peer-reviewed literature.

Specialised Databases

PsycINFO: For psychology, psychiatry, and related disciplines.
ERIC: For education research.
Sociological Abstracts: For sociology and social policy.
EconLit: For economics.

Grey Literature Sources:

To combat publication bias, we can search for unpublished trials, dissertations, and conference papers in databases like ProQuest Dissertations & Theses and OpenGrey.

Guaranteed Publishing-Level Quality

At Regent Writing, we understand that your systematic literature review is a high-stakes document, whether it’s for your PhD thesis, a funded research project, or submission to a high-impact factor journal. Therefore, “good enough” is never our standard. We are committed to delivering publishing-level quality in every project we undertake. This is evidenced by:

Uncompromising Methodological Rigour

Strict adherence to recognised protocols and guidelines such as PRISMA and the Cochrane Handbook ensures your review is academically robust and defensible.

Critical Analysis and Insight

We do more than summarise findings. Our team critically evaluates and synthesises the evidence, identifies gaps, and highlights implications for future research and practice.

Clarity, Precision, and Flow

Your review is written with clarity, precision, and logical flow, tailored to the specific expectations of your target journal or university.

Comprehensive and Transparent Documentation

We deliver a final manuscript with complete and transparent documentation, ensuring every decision and process is clearly justified.

By choosing Regent Writing, you are not just getting a document; you are gaining a dedicated partner with the advanced skills and experience to help you produce a systematic literature review of the highest calibre a robust, credible, and publishable piece of work you can be proud of.