PT - JOURNAL ARTICLE AU - R Boyle AU - M S Spence TI - “Mind your P's, Q's and T's” AID - 10.1136/hrt.2009.172593 DP - 2010 Jun 01 TA - Heart PG - 900--900 VI - 96 IP - 11 4099 - http://heart.bmj.com/content/96/11/900.short 4100 - http://heart.bmj.com/content/96/11/900.full SO - Heart2010 Jun 01; 96