Clinical Characteristics, Management, and Outcomes of Patients Diagnosed With Acute Pulmonary Embolism in the Emergency Department Initial Report of EMPEROR (Multicenter Emergency Medicine Pulmonary Embolism in the Real World Registry) - Pollack CV; Schreiber D; Goldhaber SZ; Slattery D; Fanikos J; O'Neil BJ; Thompson JR; Hiestand B; Briese BA; Pendleton RC; Miller CD; Kline JA (Journal of the American College of Cardiology (JACC), 2011)