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Kapferer, Ines; Beier, Ulrike S.; Jank, Siegfried; Persson, Rutger (2013). Randomized controlled trial: lip piercing: the impact of material on microbiological findings. Pediatric dentistry, 35(1), E23-E28. American Academy of Pediatric Dentistry
Kapferer, Ines; Beier, Ulrike S; Persson, Rutger G (2011). Tongue piercing: the effect of material on microbiological findings. Journal of adolescent health, 49(1), pp. 76-83. New York, N.Y.: Elsevier 10.1016/j.jadohealth.2010.10.008
