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Diagnostic yield and mutational spectrum in patients clinically diagnosed with different types of Usher syndrome. Numbers correspond to patient numbers. ?, unsolved patients. (A) USH1. (B) Atypical Usher syndrome (including patients with additional, non‐sensory symptoms). (C) USH2. (D) Ethnic origin of patients. Patients were counted as 1/2 + 1/2 if parents had different ethnical backgrounds.
