TY - JOUR T1 - Clusters. JF - The Journal of the Royal College of General Practitioners JO - J R Coll Gen Pract SP - 123 LP - 124 VL - 19 IS - 92 A2 - , Y1 - 1970/03/01 UR - http://bjgp.org/content/19/92/123.abstract N2 - 300 Multiple ChoicesThis is a pdf-only article and there is no markup to show you.full-text.pdf ER -