00421nas a2200133   4500000000100000000000100001008004100002100001200043700001200055245018800067300001000255490000800265022001400273       2003                            d1 aJ. Kaye1 aH. Jick00aIncidence of erectile dysfunction and characteristics of patients before and after the introduction of sildenafil in the United Kingdom: cross sectional study with comparison patients  a424-50 v326  a0959-8138