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| D423810 | Dorst | May 2000 | S |
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| D574474 | Carroll et al. | Aug 2008 | S |
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| 20070221204 | Hussong et al. | Sep 2007 | A1 |
| 20100307477 | Gallo et al. | Dec 2010 | A1 |
| Number | Date | Country | |
|---|---|---|---|
| Parent | 29338232 | Jun 2009 | US |
| Child | 29367013 | US |