For the purposes of subdivisions (f) and (g) of Section 4503, if the patient is a minor age 15 years or over, the right to refuse may be exercised either by the minor or his parent, guardian, conservator, or other person entitled to his custody.

If the patient or his parent, guardian, conservator, or other person responsible for his custody do not refuse the forms of treatment or behavior modification described in subdivisions (f) and (g) of Section 4503, such treatment and behavior modification may be provided only after review and approval by a peer review committee. The Director of Developmental Services shall, by March 1, 1977,

adopt regulations establishing peer review procedures for this purpose.