atrial fibrillation
Warfarin use among ambulatory patients with nonvalvular atrial fibrillation: the        anticoagulation and risk factors in atrial fibrillation (ATRIA) study.
Warfarin use among ambulatory  @OBJECT$   @PREDICAT$  nonvalvular  @SUBJECT$ : the        anticoagulation and risk factors in atrial fibrillation (ATRIA) study.