Use of Statements Made During Examination or Treatment.) (a) Statements made by the defendant and information gathered in the course of any examination or treatment ordered under Section 104-13, 104-17 or 104-20 shall not be admissible against the defendant unless he raises the defense of insanity or the defense of drugged or intoxicated condition, in which case they shall be admissible only on the issue of whether he was insane, drugged, or intoxicated. The refusal of the defendant to cooperate in such examinations shall not preclude the raising of the aforesaid defenses but shall preclude the defendant from offering expert evidence or testimony tending to support such defenses if the expert evidence or testimony is based upon the expert’s examination of the defendant.
     (b) Except as provided in paragraph (a) of this Section, no statement made by the defendant in the course of any examination or treatment ordered under Section 104-13, 104-17 or 104-20 which relates to the crime charged or to other criminal acts shall be disclosed by persons conducting the examination or the treatment, except to members of the examining or treating team, without the informed written consent of the defendant, who is competent at the time of giving such consent.
     (c) The court shall advise the defendant of the limitations on the use of any statements made or information gathered in the course of the fitness examination or subsequent treatment as provided in this Section. It shall also advise him that he may refuse to cooperate with the person conducting the examination, but that his refusal may be admissible into evidence on the issue of his mental or physical condition.