Between 1988 and 2004, Arnestad et al. [199] genetically analyzed 201 Norwegian cases of SIDS, screening for mutations in KCNQ1, KCNH2, SCN5A, KCNE1, KCNE2, KCNJ2, and CAV3, associated with LQTS types 1–3, 5–7, and 9, respectively. This evidence concerns the gene KCNE1 and sudden infant death syndrome.