00478nas a2200169   4500000000100000000000100001008004100002100001400043700001700057700001200074700001600086700001400102245014200116300001200258490000600270022003200276       1999                            d1 aR. Farmer1 aR. Lawrenson1 aJ. Todd1 aT. Williams1 aK. MacRae00aOral contraceptives and venous thromboembolic disease. Analyses of the UK General Practice Research Database and the UK Mediplus database  a688-7060 v5  a1355-4786 (Print) 1355-4786