00522nas a2200157   4500000000100000000000100001008004100002100001200043700001200055700002800067700001200095245020600107300001100313490000800324022003200332       2000                            d1 aH. Jick1 aJ. Kaye1 aC. Vasilakis-Scaramozza1 aS. Jick00aRisk of venous thromboembolism among users of third generation oral contraceptives compared with users of oral contraceptives with levonorgestrel before and after 1995: cohort and case-control analysis  a1190-50 v321  a0959-8138 (Print) 0959-8138