KCNH2 and sudden infant death syndrome: In a molecular autopsy on 141 SIDS cases, <6 months of age and 133 non/infants (19-58 years old) six major channelpathy genes, KCNQ1, KCNH2, SCN5A, KCNE1, KCNE2, and RyR2 were characterize in 274 cases which were autopsy negative.