Blood Samples: A research or clinical staff member collects a fasting blood draw from the participant: 2 SST (tiger top) 10 mL tubes for serum; 2 EDTA (purple top) 10 mL tubes for plasma, and 1 (light blue top) 2.7 mL tube for citrated plasma. Less than 3 tablespoons of blood are collected. A 0.5 mL aliquot of whole blood from the EDTA tube is reserved. The rest of the blood is processed and as many 0.5 mL aliquots of serum, EDTA plasma, and citrated plasma as possible are collected. In addition, a 1.5 mL aliquot of buffy coat is collected from one of the EDTA tubes.