Gonzalez-Viana Eva, Dworzynski Katharina, Murphy M Stephen, Peek Russell
National Guideline Alliance, Royal College of Gynaecologists and Obstetricians, London NW1 4RG, UK.
Gloucestershire Hospitals NHS Foundation Trust, Gloucester GL1 3NN, UK
BMJ. 2017 Sep 28;358:j4219. doi: 10.1136/bmj.j4219.