LDLR and hypertrophic cardiomyopathy: Sudden Cardiac Death Caused by a Fatal Association of Hypertrophic Cardiomyopathy (<i>MYH7</i>, p.Arg719Trp), Heterozygous Familial Hypercholesterolemia (<i>LDLR</i>, p.Gly343Lys) and SARS-CoV-2 B.1.1.7 Infection.