Skip to content
Home
Discover
Help
Content preferences
About
For researchers
Log in
Sign up
This site uses essential and optional cookies. Do you agree to using the optional cookie to store your visual and content preferences and allow you to log in?
Accept
Decline
Cookies info
This site uses cookies for better performance and user experience. Do you agree to use these cookies?
Accept
Decline
Cookies info
You have not accepted the preferences cookie and we cannot save your preferences. Please visit
the cookies page
if you want to edit your cookie choices.
listen
pause
stop
Content Preferences
Select
which
version
of the site to load
This choice can be
changed anytime
Click save
to
return
to the
article
you were
viewing
or go to the
Discover
page
Would you like to see the:
Simple
version
Complete
version (all sections)
Let me
choose
What information would you like to include in the research summary?
What
the
researchers aimed
to find out
Results
of the
research
What
type
of
research
was done
Why
the
research
was done
What
the research
means for me
and others
What
research
methods
were
used
How
to
obtain
the
treatment
detailed in the research
Background
information
on the research topic
Risks
related to the research
Is the research
trustworthy
?
Information
about the
people
who
took
part
Who
was
allowed
to
take
part
in the research
Why
the research was
done
this
way
When
the research was
done
Problems
with the research
Next steps
Where
to
find
information
related to the research
Where
the
research
was
done
Where
the
money
came
from
click to minimise
Format preferences
You have not accepted the preferences cookie and we cannot save your preferences. Please visit
the cookies page
if you want to edit your cookie choices.
letter-spacing:
A
A
word-spacing:
A
A
font-size:
A
A
line-spacing:
speaker:
Alan
Linda
speech rate:
default
slow
extra slow
dictionary:
toggle dictionary