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Pelka, Anna-Kristina; Nagler, Tonia; Hopp, Imke; Petschelt, Anselm; Pelka, Matthias Anton (August 2011). "Professional brushing study comparing the effectiveness of sonic brush heads with manual toothbrushes: a single blinded, randomized clinical trial". Clin Oral Investig. 15 (4): 451–60. doi:10.1007/s00784-010-0411-0. PMID20387085. S2CID23349358.
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