PT  - JOURNAL ARTICLE
AU  - Underwood, M
TI  - Cluster randomization.
DP  - 1998 Jul 01
TA  - British Journal of General Practice
PG  - 1436--1437
VI  - 48
IP  - 432
4099  - http://bjgp.org/content/48/432/1436.3.short
4100  - http://bjgp.org/content/48/432/1436.3.full
SO  - Br J Gen Pract1998 Jul 01; 48