A Prospective, Single-Arm, Multicenter Trial of Ultrasound-Facilitated, Catheter-Directed, Low-Dose Fibri-nolysis for Acute Massive and Submassive Pulmonary Embolism: The SEATTLE II Study - Piazza, G; Hohlfelder, B; Jaff, MR (JACC Cardiovasc Interv, 2015)