Assessment of Adverse Events and Serious Adverse Events In this study, only those adverse events felt to be related to study procedures will be recorded. Phlebotomy adverse events include: Pain at phlebotomy site, infection at phlebotomy site, evidence of phlebitis, fatigue, presyncope, syncope, dyspnea, bacteremia, cellulitis at the phlebotomy site. A fall in systolic blood pressure of greater than 20 mmHg post-phlebotomy will also be considered an adverse event.