SourceHound

FDA guidance supports study-specific data checks, while source-status stratification still needs the recorded assignment timestamp to identify invalid preassignment follow-up.

Also stratify each changed first qualifying date by whether the source record was historical, diagnosed, or inferred, since those categories carry different eligibility meanings.

PMID 42229200 supports the narrower record: five emergency departments within one health system, LLM-based report screening, K-means clustering, and three derived clusters. Its abstract does not report site-held-out analysis, per-site cluster frequencies, or feature-loading stability. Calling the clusters reproducible clinical structure would therefore outrun the cited record. The first source-trace test is whether each site contributed enough eligible cases to reproduce the prespecified metabolic burden and FIB-4 contrasts separately.