; and (3) that as a proximate result of the defendant’s negligent act or omission, the claimant suffered injuries which would not otherwise have occurred, unless the person was licensed to practice, in the State or a contiguous bordering State, a profession or specialty which would make the person’s expert testimony relevant to the issues in the case and had practiced this profession or specialty in one of these States during the year preceding the date that the alleged injury or wrongful act occurred. (b) Applicability The requirements set forth in subsection (a) shall also apply to expert witnesses testifying for the defendant as rebuttal witnesses. (c) Waiver authority The court may waive the requirements in this subsection if it determines that the appropriate witnesses otherwise would not be available. 2912. Communications following unanticipated outcome (a) Provider communications In any health care liability action, any and all statements, affirmations, gestures, or conduct expressing apology, fault, sympathy, commiseration, condolence, compassion, or a general sense of benevolence which are made by a health care provider or an employee of a health care provider to the patient, a relative of the patient, or a representative of the patient and which relate to the discomfort, pain, suffering, injury, or death of the patient as the result of the unanticipated outcome of medical care shall be inadmissible for any purpose as evidence of an admission of liability or as evidence of an admission against interest. (b) State flexibility No provision of this section shall be construed to preempt any State law (whether effective before, on, or after the date of the enactment of this Act) that makes additional communications inadmissible as evidence of an admission of liability or as evidence of an admission against interest. 2913. Expert witness qualifications (a) In general In any health care lawsuit, an individual shall not give expert testimony on the appropriate standard of practice or care involved unless the