National survey results involving dental examinations of 12 year olds who attended mainstream, state-funded schools across England from 2008 to 2009.
from Public Health England - Activity on GOV.UK https://www.gov.uk/government/publications/oral-health-survey-of-12-year-old-children-2009
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source https://tennissurfacingspecifications.tumblr.com/post/182420951009
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