1. Department of Obstetrics and Gynaecology; Pennine Acute Hospitals NHS Trust; Manchester UK
2. Pennine Acute Hospitals NHS Trust; Manchester UK
3. Obstetrics & Gynaecology; Pennine Acute NHS Trust; Manchester UK
4. Centre for Reviews and Dissemination; University of York; York UK
5. The Jessop Wing and Royal Hallamshire Hospital; Sheffield Teaching Hospitals; Sheffield UK
6. Department of Obstetrics and Gynaecology; Tameside & Glossop Acute Services NHS Trust; Ashton-Under-Lyne UK