Neurological Diseases

On the same selection, before the area filter. Papers without MeSH terms stay in this coverage line; they are never in any area or in the grey row. It describes the corpus, not how completely this area’s research is captured.

Papers without MeSH terms cannot be assigned to any area, so this profile is never a complete count of the area’s research, and it does not measure how completely that research is captured. Coverage: records captured by the named sources that meet the published eligibility rules; coverage is not exhaustive.

The area's three counts narrowed to industry: research papers coded industry-involved, industry-led clinical trials and industry-led observational studies, each with its share of the area's own count. They are three kinds of record and are never added together.

Industry in papers comes from each paper's own industry code; industry in registrations comes from the lead sponsor. They are different measures of different records and are never combined.

Industry in registrations means a lead sponsor that is a company making or selling health products (drugs, vaccines, biotechnology, devices, diagnostics, health software or medical nutrition), as the industry guide defines it in its section two, or a contract research organisation with such a company listed as collaborator. Hospital groups and other providers that ClinicalTrials.gov labels “industry” are not counted. Withdrawn studies are not counted.

Journals that follow ICMJE policy require clinical trials to be registered before enrolment begins, in ClinicalTrials.gov or another accepted registry; observational studies have no such requirement, so registered observational studies are a small, selective part of observational research. These figures count studies recorded in ClinicalTrials.gov; they do not measure total research volume, study completion or financial investment.

Counts describe recorded activity; they do not measure investment, quality or performance.

Every company credited with at least one industry-led clinical trial or observational study in this area, 2021–2025, with both counts: two counts, never one total. Each study is credited to one company, exactly as the industry-led counts decide it: its lead sponsor or, for a contract research organisation's study, its company collaborator listed in the registration. So the companies' studies add up to the area's industry-led counts. A study in several areas counts in each. Names are shown as registered, with no grouping into parent companies.

There is no rank column. The list opens with the most clinical trials, ties A–Z. Every count above zero opens its records.

Only studies listing a Saudi site are counted. Industry in registrations means a lead sponsor that is a company making or selling health products (drugs, vaccines, biotechnology, devices, diagnostics, health software or medical nutrition), as the industry guide defines it in its section two, or a contract research organisation with such a company listed as collaborator. Hospital groups and other providers that ClinicalTrials.gov labels “industry” are not counted. Withdrawn studies are not counted.

Journals that follow ICMJE policy require clinical trials to be registered before enrolment begins, in ClinicalTrials.gov or another accepted registry; observational studies have no such requirement, so registered observational studies are a small, selective part of observational research. These figures count studies recorded in ClinicalTrials.gov; they do not measure total research volume, study completion or financial investment.

The counts describe registered activity; they do not measure investment, quality or performance.

Every institution on the approved list with at least one research-related publication, clinical trial or observational study in this area, 2021–2025. Three counts, never one total: a paper, a clinical trial and an observational registration are different kinds of record.

They are counted exactly as on Institutions & Clusters: publications in full; a parent institution's row also counts its units' papers and studies, so rows overlap and are never added together; clinical trials and observational studies count registrations listing the institution as a site, and a listed site does not prove that participants were recruited there. Institutions are named as OpenAlex records them.

There is no rank column. The list opens with the most publications, ties A–Z; the switch orders it by clinical trials, observational studies or A–Z. Every count above zero opens its records. No citation measure is given here.