RT Journal Article SR Electronic T1 Improving the evidence base for pre-travel advice: the importance of surveillance of travel-associated infection JF British Journal of General Practice JO Br J Gen Pract FD British Journal of General Practice SP 566 OP 568 VO 55 IS 516 A1 Joanne Lawrence A1 Jane Jones A1 David R Hill YR 2005 UL http://bjgp.org/content/55/516/566.abstract AB