RT @NEJM: Implantation of device to narrow the coronary sinus reduced symptoms, improved QOL in patients w/ refractory angina. http://t.co/sXlUGulGTf

RT @NEJM: Implantation of device to narrow the coronary sinus reduced symptoms, improved QOL in patients w/ refractory angina. http://t.co/sXlUGulGTf (via Twitter http://ift.tt/1zi7aCq)