Letter to the EditorMass Screening and Intervention by Mass Communication: The HAPPY ProgramAuthorsLeonard HofstraEduard LauferFroukje DijkMarja van DieijenHein J.J. WellensJagat NarulaAbstractYear: 2011Volume: 6 Issue: 4Page/Article: 221-222DOI: 10.1016/j.gheart.2011.08.005Published on Dec 1, 2011CC BY 4.0