| Characteristic | Penetration rate |
|---|---|
| - | - |
| - | - |
| - | - |
| - | - |
| - | - |
| - | - |
| - | - |
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Sources
Release date
April 2014
Region
United States
Survey time period
2007 to 2013
Supplementary notes
The original source does not give any information regarding the exact publication date. The date given is the date of the conference 2014.
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