TY - JOUR AN - 57 AU - Hannaford,P.C. AU - Selvaraj,S. AU - Elliott,A.M. AU - Angus,V. AU - Iversen,L. AU - Lee,A.J. TI - Cancer risk among users of oral contraceptives: cohort data from the Royal College of General Practitioner's oral contraception study JO - BMJ PY - 2007 VL - 335(7621) SP - 651-659 M2 - 651 DO - 10.1136/bmj.39289.649410.55 ER -