EXHIBIT 1


              JOINT ACQUISITION STATEMENT PURSUANT TO RULE 13d-1(k)

         The undersigned acknowledge and agree that the foregoing statement on
Schedule 13G is filed on behalf of each of the undersigned and that all
subsequent amendments to this statement on Schedule 13G shall be filed on behalf
of each of the undersigned without the necessity of filing additional joint
acquisition statements. 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 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: June 2, 2006


                                      HEALTHCOR MANAGEMENT, L.P.

                                      By: HealthCor Associates, LLC, general
                                          partner of HealthCor Management, L.P.

                                          By: /s/ Arthur Cohen
                                              ---------------------------------
                                          Name: Arthur Cohen
                                          Title: Manager

                                          By: /s/ Joseph Healey
                                              ---------------------------------
                                          Name: Joseph Healey
                                          Title: Manager

                                      /s/ Joseph Healey
                                      -----------------------------------------
                                      JOSEPH HEALEY, Individually


                                      /s/ Arthur Cohen
                                      -----------------------------------------
                                      ARTHUR COHEN, Individually