Mesh : Adolescent Cardiology / legislation & jurisprudence Cation Transport Proteins / deficiency genetics Child Child, Preschool Death, Sudden, Cardiac / prevention & control Ether-A-Go-Go Potassium Channels Genetic Predisposition to Disease Genetic Testing / legislation & jurisprudence Genotype Humans Infant Italy Long QT Syndrome / diagnosis genetics Malpractice / legislation & jurisprudence Potassium Channels / deficiency genetics Potassium Channels, Voltage-Gated Practice Guidelines as Topic Sudden Infant Death / etiology prevention & control