1
Published 2013
Royal College of Obstetricians and Gynaecologists

2
Published 2013
Royal College of Obstetricians and Gynaecologists

3
Published 2013
Royal College of Obstetricians & Gynaecologists

4
Published 2017
National Institute for Health and Care Excellence

5
Published 2017
National Institute for Health and Care Excellence

6
Published 2016
National Institute for Health and Care Excellence

9
Published 2008
RCOG Press

11
Published 2009
RCOG Press

12
Published 2007
RCOG Press

14
Published 2008
RCOG Press

15
by Welsh, Andrew
Published 2010
Royal College of Obstetricians and Gynaecologists