00445nas a2200157   4500000000100000000000100001008004100002100001200043700001500055700001200070700001200082245016100094300001100255490000700266022001400273       2009                            d1 aS. Jick1 aK. Hagberg1 aJ. Kaye1 aH. Jick00aThe risk of unintended pregnancies in users of the contraceptive patch compared to users of oral contraceptives in the UK General Practice Research Database  a142-510 v80  a0010-7824