1
Published 2015
National Institute for Health and Care Excellence

2
Published 2013
Royal College of Obstetricians and Gynaecologists

3
Published 2013
Royal College of Obstetricians and Gynaecologists

4
Published 2013
Royal College of Obstetricians & Gynaecologists

5
Published 2015
National Collaborating Centre for Women's and Children's Health

6
Published 2015
National Collaborating Centre for Women's and Children's Health

10
Published 2008
RCOG Press

12
Published 2009
RCOG Press

13
Published 2007
RCOG Press

15
Published 2008
RCOG Press

17
by Welsh, Andrew
Published 2010
Royal College of Obstetricians and Gynaecologists

19
Published 2008
RCOG Press