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Sanger sequencing for SCN5A and KCNH2 mutations. KCNH2 p.307_308del and SCN5A p.R1865H of the proband were validated as positive by Sanger sequencing. Additionally, I: 1 and II: 2 carried with the heterozygous for SCN5A p.R1865H. Except II: 1, other family members did not carry with the KCNH2 mutation
