Physician Characteristics and the Initiation of Beta-Adrenergic Blocking Agent Therapy After Acute Myocardial Infarction in a Managed Care PopulationByS. Nicole Fehrenbach, MPP,Daniel S. Budnitz, MD, MPH,Julie A. Gazmararian, MPH, PhD,Harlan M. Krumholz, MDJuly 1st 2001