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