00442nas a2200157   4500000000100000000000100001008004100002100001400043700001400057700002100071700001700092245014400109300001000253490000700263022001400270       2012                            d1 aA. Dregan1 aH. Moller1 aT. Murray-Thomas1 aM. Gulliford00aValidity of cancer diagnosis in a primary care database compared with linked cancer registrations in England. Population-based cohort study  a425-90 v36  a1877-7821