RT Journal Article SR Electronic T1 FSRH Guideline (February 2021) Progestogen-only Implant JF BMJ Sexual & Reproductive Health JO BMJ Sex Reprod Health FD British Medical Journal Publishing Group SP 1 OP 62 DO 10.1136/bmjsrh-2021-CHC VO 47 IS Suppl 1 YR 2021 UL http://jfprhc.bmj.com/content/47/Suppl_1/1.abstract AB