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Source
Release date
April 2013
Region
United States
Survey time period
2011 to 2013 (2013: February 15, 2013 to March 4, 2013)
Number of respondents
2013: n = 8,867
Age group
2 years and older
Method of interview
Online survey
Supplementary notes
The information on the 2013 methodology is available .
The source does not provide information on the 2012 methodology.
The figures for 2011 were taken from an .
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