Bewley Susan, Kelly Brenda, Darke Katrina, Erskine Katrina, Gerada Clare, Lohr Patricia, de Zulueta Paquita
Women's Health Academic Centre, St Thomas' Hospital, London SE1 7EH, UK
Oxford University Hospitals NHS Trust, Oxford, UK.
BMJ. 2015 Sep 30;351:h5146. doi: 10.1136/bmj.h5146.