Eichhorn E J, Alvarez L G, Jessen M E, Fass S M, Chao R Y, Haagen D, Grayburn P A
Cardiac Catheterization Laboratory (IIIA2), Dallas Veterans Administration Medical Center, Texas.
Am J Cardiol. 1992 Aug 15;70(4):542-5. doi: 10.1016/0002-9149(92)91208-l.