00388nas a2200133   4500000000100000000000100001008004100002100001700043700001400060245010900074300003200183490000700215022003200222       2000                            d1 aR. Lawrenson1 aR. Farmer00aVenous thromboembolism and combined oral contraceptives: does the type of progestogen make a difference?  a21S-28S; discussion 37S-38S0 v62  a0010-7824 (Print) 0010-7824