KCNH2 and sudden infant death syndrome: 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.