Joint Filing Agreement
Exhibit
99.1
Pursuant to Rule 13d-1(k)(1) promulgated under the Securities Exchange Act of 1934, as amended, the
undersigned agree that the Statement on Schedule 13D to which this exhibit is attached is filed on
behalf of each of them in the capacities set forth below.
| U.S. RENAL CARE, INC. |
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| By: | /s/ Xxxxxx X. Xxxxxxxx | |||
| Name: | Xxxxxx X. Xxxxxxxx | |||
| Title: | Senior Vice President and General Counsel | |||
| URCHIN MERGER SUB, INC. |
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| By: | /s/ Xxxxxx X. Xxxxxxxx | |||
| Name: | Xxxxxx X. Xxxxxxxx | |||
| Title: | Vice President | |||
Dated: April 23, 2010
