PT - JOURNAL ARTICLE AU - WILLIAM J PENNY TI - Patient delay in calling for help: the weakest link in the chain of survival? AID - 10.1136/heart.85.2.121 DP - 2001 Feb 01 TA - Heart PG - 121--122 VI - 85 IP - 2 4099 - http://heart.bmj.com/content/85/2/121.short 4100 - http://heart.bmj.com/content/85/2/121.full SO - Heart2001 Feb 01; 85