3. EndoPAT: Endothelial function will be measured in subjects who qualify for liver biopsy and consent to phase II using the EndoPAT 2000®.. Every effort will be made to conduct the EndoPat test on the same day as the CCTA for subject convenience. The EndoPAT 2000® uses digital pulse amplitude tonometry. The EndoPAT device comprises a pneumatic plethysmograph that applies uniform pressure the surface of the distal finger. Throughout the test, the inflation pressure of the device will be set at 10 mmHg below the diastolic blood pressure or 70 mmHg, whichever is lower. Baseline pulse amplitude measurements will be taken for 5 minutes. Arterial flow will then be transiently interrupted by inflating a pneumatic cuff placed on the patient's forearm. The cuff will be inflated to 200 mmHg or 60 mmHg plus the systolic blood pressure, whichever is higher. The pulse amplitude will be recorded for 5 minutes during the occlusion phase. The blood pressure cuff is then deflated and post test measurements are recorded for 5 additional minutes. Pre and post test pulse amplitudes are compared to assess the degree of reactive hyperemia.