The purpose of this section is to encourage more effective utilization of the skills of physicians or groups of physicians by enabling them to delegate health care tasks to qualified assistants when such delegation is consistent with the patient’s health and welfare. The boards shall adopt, by rule, the general principles that supervising physicians must use in developing the scope of practice of a physician assistant under direct supervision and under indirect supervision. These principles shall recognize the diversity of both specialty and practice settings in which physician assistants are used.