PT - JOURNAL ARTICLE AU - H J Simpson AU - S J Gandy AU - J G Houston AU - A D Struthers TI - The Authors' response AID - 10.1136/hrt.2010.195867 DP - 2010 Jan 01 TA - Heart PG - hrt.2010.195867 4099 - http://heart.bmj.com/content/early/2010/05/17/hrt.2010.195867.short 4100 - http://heart.bmj.com/content/early/2010/05/17/hrt.2010.195867.full