Find a full-text copy by checking Europe PMC for a linked full text, then query Unpaywall for open-access locations using the paper's DOI, and read the methods section in whichever full-text version you retrieve. Europe PMC supports fielded searches across life-science literature and links to available full text, so a record there may point you to a readable version beyond the abstract. If no full text is linked, Unpaywall records describe open-access locations associated with a DOI, including host type, version, license information when available, and a selected best open-access location. Use the DOI from the abstract page as the query key, and check the version field on each location, since a repository copy may be a preprint or accepted manuscript whose methods section can differ from the published version.
- Search Europe PMC for the paper's title or DOI and open the record. Expected result: a link to available full text if Europe PMC has one; if none appears, move to the next step.
- Query Unpaywall with the DOI. Expected result: a list of open-access locations and a selected best location; open the best location first, then other listed hosts if that copy is incomplete.
- If Unpaywall returns no usable location, search CORE, which aggregates open-access research outputs and offers discovery services for repository copies.
- Open the full text and locate the methods section before appraising the study, so your assessment reflects how the study was actually conducted and what the abstract reports.
A missing link in one service leaves the question unresolved; try the next service and the publisher page for the DOI. When you retrieve a copy, note its version and host type so you know whether you are reading the published methods or an earlier manuscript.