JOINT FILING AGREEMENT
Exhibit 99.1
The undersigned hereby agree that the foregoing statement on Schedule 13G is filed on behalf of
each of the undersigned in accordance with the provisions of Rule 13d-1(k) under the Securities
Exchange Act of 1934, as amended, and that all subsequent amendments to this statement on Schedule
13G may be filed on behalf of each of the undersigned without the necessity of filing additional
joint filing agreements.
Dated: January 18, 2008
| SIGMA CAPITAL MANAGEMENT, LLC |
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| By: | /s/ Xxxxx Xxxxxxxx | |||
| Name: | Xxxxx Xxxxxxxx | |||
| Title: | Authorized Person | |||
| SIGMA CAPITAL ASSOCIATES, LLC |
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| By: | /s/ Xxxxx Xxxxxxxx | |||
| Name: | Xxxxx Xxxxxxxx | |||
| Title: | Authorized Person | |||
| XXXXXX X. XXXXX |
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| By: | /s/ Xxxxx Xxxxxxxx | |||
| Name: | Xxxxx Xxxxxxxx | |||
| Title: | Authorized Person | |||
