Recruitment began on April 4th 2011 and closed at the end of December
The study was launched across 78 UK centres, of these participating centres 76 have actively recruited participants into the study.
The red points on the map show the coverage of the participant centres across the country.
To see a complete list of contributing centres, please click here.
A list of the sites taking part in the Follow-up Study will be uploaded when all sites have joined the study.