The proceedings and records of a dental review committee except those concerning the investigation and consideration of Medicare and Medicaid charges or payments, shall be held in confidence and shall not be subject to discovery or introduction into evidence in any civil action arising out of the matters which are the subject of evaluation and review by the committee; and no person who was in attendance at a meeting of the committee shall be permitted or required to testify in any civil action as to any evidence or other matters produced or presented during the proceedings of the committee or as to any findings, recommendations, evaluations, opinions, or other actions of the committee or any members thereof, except with regard to Medicare and Medicaid charges or payments: Provided, however, that information, documents or records otherwise available from original sources are not to be construed as immune from discovery or use in any civil action merely because they were presented during proceedings of a committee, nor should any person who testifies before a committee or who is a member of a committee be prevented from testifying as to matters within his knowledge, but the witness shall not be asked about his testimony before a committee or opinions formed by him as a result of the committee hearings, except with regard to Medicare and Medicaid charges or payments. (1979, 2nd Sess., c. 1192, s. 1.)