NEW YORK (AP) -- The 1979 disappearance of Etan Patz helped catalyze a national missing-children's movement. Six-year-old Etan was one of the first vanished children whose case was publicized in what became a high-profile way: on milk cartons. His disappearance also helped usher in an age of parental anxiety. On Friday, opening statements are set to be heard in the murder and kidnapping trial of Pedro Hernandez, who confessed in 2012.