RT Journal Article SR Electronic T1 Importance of needle size for effective intramuscular delivery of vaccines. JF British Journal of General Practice JO Br J Gen Pract FD British Journal of General Practice SP 753 OP 753 VO 50 IS 458 A1 J Zuckerman YR 2000 UL http://bjgp.org/content/50/458/753.1.abstract AB