(1) individuals or organizations who are approved, licensed or otherwise regulated to practice or operate in the health care field under the laws of the Commonwealth, including, but not limited to, the following individuals or organizations:

(2) individuals licensed to practice veterinary medicine under the laws of this Commonwealth.

“Professional society” includes medical, veterinary, psychological, nursing, dental, optometric, pharmaceutical, chiropractic and podiatric organizations having as members at least a majority of the eligible licentiates in the area or health care facility or agency served by the particular society.

“Review organization” means any committee engaging in peer review, including a hospital utilization review committee, a hospital tissue committee, a health insurance review committee, a hospital plan corporation review committee, a professional health service plan review committee, a dental review committee, a physicians' advisory committee, a veterinary review committee, a nursing advisory committee, any committee established pursuant to the medical assistance program, and any committee established by one or more State or local professional societies, to gather and review information relating to the care and treatment of patients for the purposes of (i) evaluating and improving the quality of health care rendered; (ii) reducing morbidity or mortality; or (iii) establishing and enforcing guidelines designed to keep within reasonable bounds the cost of health care. It shall also mean any hospital board, committee or individual reviewing the professional qualifications or activities of its medical staff or applicants for admission thereto. It shall also mean a committee of an association of professional health care providers reviewing the operation of hospitals, nursing homes, convalescent homes or other health care facilities.