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Branch LG, Kesty K, Krebs E, Wright L, Leger S, David LR. Deformational plagiocephaly and craniosynostosis: trends in diagnosis and treatment after the "back to sleep" campaign. The Journal of craniofacial surgery. 2015 Jan;26(26). 147-50.
In 1992, the American Academy of Pediatrics discouraged prone sleeping positions because of its association with sudden infant death syndrome. After this was an increased incidence of deformational plagiocephaly (DP).