Exhibit AAmendment to Schedule 13d • October 12th, 2004 • Oak Management Corp • Services-specialty outpatient facilities, nec
Contract Type FiledOctober 12th, 2004 Company IndustryEach of the undersigned hereby agrees that the Amendment No. 7 to Schedule 13D filed on the date hereof with respect to the shares of Common Stock of Psychiatric Solutions, Inc. has been filed on behalf of the undersigned.