> **System status: unable to retrieve evidence**
>
> No papers, trials, patents, or other source documents were successfully retrieved in this run, and no citable context IDs were created.
>
> Because there are no source contexts available, PMIDs, direct quotations, URLs, publication dates, and evidence-grounded citations cannot be provided in the report.
>
> **Actionable checklist for a fully cited next run:**
> - Provide PDFs or DOI links for key EDN3/EDNRB Waardenburg–Shah references.
> - Enable literature retrieval access (e.g., scholar/PubMed-compatible search connectivity).
> - Seed the run with known PMIDs, OMIM/Orphanet entries, or GeneReviews links.
> - Re-run retrieval before synthesis so citable contexts can be generated.


*Blockquote: This blockquote documents that the current run produced no retrievable evidence contexts, preventing a properly cited report. It also gives a short checklist to enable a fully evidence-backed follow-up run.*