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For over 20 years the Agencyfor Health Care Policy and Research (AHCPR) and its predecessor, the National Center for Health Services Research and Health Care Technology Assessment (NCHSR), have supported research on the
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Stored only when both papers are in the corpus — 64 citations exist upstream.
Papers that cite the same references — the relational fallback while embeddings are still backfilling.
Imported from OpenAlex (CC0) — nothing here is generated.