| Quarterly report for the period ended March 31, 2012 (SEC Form 17Q) | Mar 31, 2012 |
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| Quarterly report for the period ended September 30, 2011 (SEC Form 17Q) | Sep 30, 2011 |
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| Quarterly report for the period ended June 30, 2011 (SEC Form 17Q) | Jun 30, 2011 |
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| Quarterly report for the period ended March 31, 2011 (SEC Form 17Q) | Mar 31, 2011 |
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