RT Journal Article SR Electronic T1 Combined oral contraception and cancer JF British Journal of Family Planning JO Br J Fam Plann FD BMJ Group SP 237 OP 240 DO 10.1783/147118900101194698 VO 26 IS 4 A1 Jacqui Tuckey YR 2000 UL http://jfprhc.bmj.com/content/26/4/237.abstract AB