 - Concurrent use of coumadin or warfarin is okay. The follow-up monitoring for prothrombin PT, partial thromboplastin time PTT and International Normalized Ratio INR for patients on warfarin andor coumadin will follow the standard of care as dictated by the prescribing physician. If the prescribing physician is not a Moffitt physician, then the prescribing physician will be notified by the research staff of the subject participating in the study, and monitors for PT, PTT and INR will be obtained from patient during the 6 week study for review. 