Parents were randomly assigned to receive @ of @ interventions : ( @ ) information explaining the lack of evidence that MMR causes autism from the Centers for Disease Control and Prevention ; ( @ ) textual information about the dangers of the diseases prevented by MMR from the Vaccine Information Statement ; ( @ ) images of children who have diseases prevented by the MMR vaccine ; ( @ ) a dramatic narrative about an infant who almost died of measles from a Centers for Disease Control and Prevention fact sheet ; or to a control group .