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Tricarico A, Molteni G, Mattioli F, Guerra A, Mordini B, Presutti L, Iughetti L (November–December 2012). "Nipple trauma in infants? Bednar aphthae". American Journal of Otolaryngology. 33 (6): 756–7. doi:10.1016/j.amjoto.2012.06.009. PMID22884485.