additional_studies_date:
May 2008
| Frequency |
Percent |
|
| 1-3 years |
14 |
32.6% |
| 4-6 years |
17 |
39.5% |
| 7-9 years | 8 |
18.6% |
| < 1 year |
4 |
9.3% |
| Frequency |
Percent |
|
| 1-3 years |
14 |
32.6% |
| 4-6 years |
17 |
39.5% |
| 7-9 years | 8 |
18.6% |
| < 1 year |
4 |
9.3% |
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