Effectiveness of educational materials designed to change knowledge and behaviors regarding crying and shaken baby syndrome in mothers of newborns : a randomized controlled trial Ronald G. Barr, Frederick P. Rivara, Marilyn Barr, Peter Cummings, James Taylor, Liliana J. Lengua, Emily Meredith-Benitz
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Pediatrics, 2009, 123(3), 972-980
This study was a randomised, controlled trial conducted in prenatal classes, maternity wards, and pediatric practices. There were 1374 mothers of newborns randomly assigned to the PURPLE intervention and 1364 mothers to the control group. See a summary and rating of this research by the Californian Evidence-Based Clearinghouse for Child Welfare.