RT Journal Article SR Electronic T1 FSRH Guideline (January 2019, amended October 2023) Combined Hormonal Contraception JF BMJ Sexual & Reproductive Health JO BMJ Sex Reprod Health FD British Medical Journal Publishing Group SP 1 OP 93 DO 10.1136/bmjsrh-2018-CHC VO 45 IS Suppl 1 YR 2019 UL http://jfprhc.bmj.com/content/45/Suppl_1/1.abstract AB