RT Journal Article SR Electronic T1 Migraine and use of combined hormonal contraceptives: a clinical review JF Journal of Family Planning and Reproductive Health Care JO J Fam Plann Reprod Health Care FD British Medical Journal Publishing Group SP 159 OP 169 DO 10.1783/147118907781004750 VO 33 IS 3 A1 E Anne MacGregor YR 2007 UL http://jfprhc.bmj.com/content/33/3/159.abstract AB