Letter: Propranolol, digoxin, and angina pectoris.
D000787:Angina Pectoris / Q000188:drug therapy*; D004077:Digoxin / Q000627:therapeutic use*; D006801:Humans; D011433:Propranolol / Q000627:therapeutic use*; D012107:Research Design
D004077:Digoxin; D011433:Propranolol