Sec. 2. If a patient's written consent is:
(1) signed by the patient or the patient's authorized representative;
(2) witnessed by an individual at least eighteen (18) years of age; and
(3) explained, orally or in the written consent, to the patient or the patient's authorized representative before a treatment, procedure, examination, or test is undertaken;
a rebuttable presumption is created that the consent is an informed consent.