Response by Kusters et al to Letter Regarding Article, "Effect of Rosuvastatin on Carotid Intima-Media Thickness in Children With Heterozygous Familial Hypercholesterolemia: The CHARON Study (Hypercholesterolemia in Children and Adolescents Taking Rosuvastatin Open Label)". Circulation. 2018 02 06; 137(6):641-642.