RT Journal Article SR Electronic T1 Cased based learning on the web JF Heart JO Heart FD BMJ Publishing Group Ltd and British Cardiovascular Society SP 979 OP 979 DO 10.1136/heart.89.9.979 VO 89 IS 9 A1 Roger Hall YR 2003 UL http://heart.bmj.com/content/89/9/979.1.abstract AB