Liability at law shall not attach to a medical practitioner, nurse or other person prescribed under a regulation in respect of an act done or omitted in the course of rendering medical care, aid or assistance to an injured person in circumstances of emergency—
(a) at or near the scene of the incident or other occurrence constituting the emergency; or
(b) while the injured person is being transported from the scene of the incident or other occurrence constituting the emergency to a hospital or other place at which adequate medical care is available;if—
(c) the act is done or omitted in good faith and without gross negligence; and
(d) the services are performed without fee or reward or expectation of fee or reward.