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Numerical figures indicate number of cases. Suffix “R” in the diagnosis indicates that the particular case relapsed with dystonic storm at a later time point. AADC = aromatic l-amino acid decarboxylase; CP = cerebral palsy; IEM = inborn error of metabolism; PKAN = pantothenate kinase-associated neurodegeneration; SSPE = subacute sclerosing panencephalitis.
