1. Royal College of Obstetricians and Gynaecologists; National Guideline Alliance; 27 Sussex Place Regents Park London England UK NW1 4RG
2. School of Social and Community Medicine, University of Bristol; Centre for Academic Primary Care; Canynge Hall 39 Whatley Road Bristol UK BS8 2PS
3. Universities of Brighton and Sussex; Brighton and Sussex Medical School; BSMS Teaching Building Uinversity of Sussex, Falmer Brighton East Sussex UK BN1 9PX