The Atascadero State Hospital shall have an advisory board of seven persons appointed by the Governor, each of whom holds office for the term of three years. To the extent feasible the composition of board membership shall consist of two persons, who at the time of their appointment are relatives of the patient population, three representatives of professional disciplines serving the patient population, and two representatives of the general public. The board shall advise and consult with the department with respect to the conduct of the hospital. The members of the board shall serve without compensation other than necessary expenses incurred in attendance at meetings.