RT Journal Article SR Electronic T1 Appropriate analysis and reporting of cluster randomised trials JF Emergency Medicine Journal JO Emerg Med J FD BMJ Publishing Group Ltd and the British Association for Accident & Emergency Medicine SP 156 OP 156 VO 22 IS 2 A1 S Goodacre YR 2005 UL http://emj.bmj.com/content/22/2/156.abstract AB