00361nas a2200145   4500000000100000000000100001008004100002100001700043700001200060700001200072245008200084300001000166490000700176022003200183       1999                            d1 aC. Vasilakis1 aS. Jick1 aH. Jick00aThe risk of venous thromboembolism in users of postcoital contraceptive pills  a79-830 v59  a0010-7824 (Print) 0010-7824