Villanueva Gemma, Murphy M Stephen, Vickers David, Harrop Emily, Dworzynski Katharina
National Guideline Alliance, Royal College of Gynaecologists and Obstetricians, London NW1 4RG, UK.
Cambridgeshire Community Services NHS Trust, St Ives PE27 4LG, UK.
BMJ. 2016 Dec 8;355:i6385. doi: 10.1136/bmj.i6385.