1
Published 2010
National Clinical Guideline Centre

2
Published 2015
National Institute for Health and Care Excellence

3
Published 2015
National Institute for Health and Care Excellence

4
Published 2008
RCOG Press

5
Published 2010
National Clinical Guideline Centre

6
Published 2011
RCOG Press at the Royal College of Obstetricians and Gynaecologists

7
Published 2011
RCOG Press at the Royal College of Obstetricians and Gynaecologists

8
Published 2012
published by the National Clinical Guideline Centre at the Royal College of Physicians

9
Published 2007
RCOG Press

10
Published 2012
published by the National Clinical Guideline Centre at the Royal College of Physicians

11
Published 2012
British Psychological Society
...National clinical guideline...

12
Published 2009
RCOG Press

13
Published 2012
National Clinical Guideline Centre at the Royal College of Physicians
...Headaches (National Clinical Guideline Centre for Acute and Chronic Conditions (Great Britain))...

14
Published 2012
National Clinical Guideline Centre at the Royal College of Physicians
...Headaches (National Clinical Guideline Centre for Acute and Chronic Conditions (Great Britain))...

15
Published 2010
British Psychological Society
...National clinical practice guideline...

16
Published 2011
published by the National Clinical Guideline Centre at the Royal College of Physicians

18
Published 2011
British Psychological Society
...National clinical guideline...

19
Published 2008
Royal College of Nursing

20
by Welsh, Andrew
Published 2010
Royal College of Obstetricians and Gynaecologists