TY - JOUR T1 - The authors reply JF - British Heart Journal JO - Heart SP - 610 LP - 611 DO - 10.1136/hrt.55.6.610-b VL - 55 IS - 6 AU - E E Laird AU - E D Williams AU - D Rankin AU - C J Gibson AU - B Mittra Y1 - 1986/06/01 UR - http://heart.bmj.com/content/55/6/610.2.abstract N2 - 300 Multiple ChoicesThis is a pdf-only article and there is no markup to show you.full-text.pdf ER -