<qa>  What is the purpose of this research study?The purpose of this research study is to measure the amount of atorvastatin and ETC-1002 in the blood, to determine how ETC-1002 affects the level of LDL-cholesterol bad cholesterol and other markers of health and disease in blood and urine, and to see how ETC-1002 is tolerated in the body compared to placebo when added to stable atorvastatin 80 mg background therapy in statin-treated patients. 