JOINT FILING AGREEMENT PURSUANT TO RULE 13d-1(k)
Exhibit 99.6
PURSUANT TO RULE 13d-1(k)
The undersigned acknowledge and agree that the foregoing statement on Schedule 13D is filed on
behalf of each of the undersigned and that all subsequent amendments to this statement on Schedule
13D may be filed on behalf of each of the undersigned without the necessity of filing additional
joint filing agreements. The undersigned acknowledge that each shall be responsible for the timely
filing of such amendments, and for the completeness and accuracy of the information concerning him
or it contained herein or therein, but shall not be responsible for the completeness and accuracy
of the information concerning the others, except to the extent that he or it knows or has reason to
believe that such information is inaccurate.
DATED: July 3, 2008
| XXXXXXX LABORATORIES, INC. |
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| By: | /s/ Xxxxx Xxxxxxx | |||
| Name: | Xxxxx Xxxxxxx | |||
| Title: | Senior Vice President and General Counsel | |||
| /s/ XXXXXXX X. XXXXXXX | ||||
| XXXXXXX X. XXXXXXX | ||||
