New Oral Anticoagulants forstroke prevention in atrialfibrillationBharat K.Kantharia, MD, FRCP, FAHA, FACC, FESC, FHRSProfessor of Medicine,Director, Cardiac Electrophysiology Services,Director, Cardinc Electrophysiology Laboratorles,Heart and Vascular Institute- Memorial Hermann Hospital Director, Cardiac Electrophysiology Fellow ship Training,The University of Texas-HSC Houston Houston