Surveillance of primary antibiotic resistance of Helicobacter pylori at centres in England and Wales over a six-year period (2000-2005) Chisholm, S A and Teare, E L and Davies, K and Owen, R J, Eurosurveillance, 12, 721 (2007), https://doi.org/10.2807/esm.12.07.00721-en