> **Final limitation notice**
>
> No citable source contexts were retrievable in this run, so a PMID-cited report on EDN3/EDNRB Waardenburg–Shah syndrome cannot be generated here.
>
> Substitute artifacts prepared instead include a retrieval audit, report scaffolds, a reproducible query list, and a minimum source set needed for a fully cited follow-up run.
>
> To remediate this limitation, provide or ingest retrievable authoritative sources such as OMIM and Orphanet disease pages, a GeneReviews chapter, PubMed-indexed primary papers or PDFs/DOIs on EDN3/EDNRB-associated Waardenburg syndrome type IV, plus ClinVar, gnomAD, and MGI/IMPC records.


*Blockquote: This blockquote documents that no citable contexts were available in the session, preventing a PMID-cited disease report. It also summarizes the substitute artifacts created and the concrete source inputs needed for a successful evidence-grounded follow-up run.*