_:vb50943739 "An Usher syndrome characterized by progressive hearing loss typically beginning in late childhood, variable vestibular dysfunction and onset of retinitis pigmentosa by the second decade of life."^^ . _:vb50943739 . _:vb50943739 . _:vb50943739 . _:vb50943739 "url:https://www.ncbi.nlm.nih.gov/pubmed/2909824"^^ . _:vb50943739 . _:vb50943739 . _:vb50943739 "url:https://www.ncbi.nlm.nih.gov/pubmed/8864816"^^ . _:vb50943739 . _:vb50943739 "url:https://ghr.nlm.nih.gov/condition/usher-syndrome"^^ .