"We emphasize that our holding that § 3(4) is invalid does not suggest that every minor, regardless of age or maturity, may give effective consent for termination of her pregnancy. See Bellotti v. Baird, post, p. 428 U. S. 132. The fault with § 3(4) is that it imposes a special consent provision, exercisable by a person other than the woman and her physician, as a prerequisite to a minor's termination of her pregnancy, and does so without a sufficient justification for the restriction. It violates the strictures of Roe and Doe."