00404nas a2200145   4500000000100000000000100001008004100002100001600043700001200059700001300071245014200084300001100226490000700237022001400244       2009                            d1 aH. El-Serag1 aC. Hill1 aR. Jones00aSystematic review: the epidemiology of gastro-oesophageal reflux disease in primary care, using the UK General Practice Research Database  a470-800 v29  a0269-2813