Serum Biomarker and DNA Samples Blood will be collected by peripheral venipuncture at enrollment as a source of serum and plasma for biomarker analysis, as well as a source of DNA for genetic testing. Fasting samples are requested but if this is not possible logistically, non-fasting samples can be acquired and noted as such. The investigators will also ask subjects to refrain from strenuous exercise for 24 hours prior to blood draw to decrease the potential for spuriously elevated biomarkers that reflect the influence of vigorous physical activity.