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. 2021 Aug 19;48(4):439–448. doi: 10.1007/s10396-021-01120-3

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© The Author(s) 2021, corrected publication 2021

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Fig. 5 — a Images of biofilm on the bottoms of the 6-well plates in “Examination 1” (24-h irradiation). Left: US ( +) plate. Right: US (−) plate. The amount of biofilm on the bottoms of US ( +) plates was higher than that of US (−) plates. b Comparison of the amount of biofilm formed between the ultrasound (US) irradiation group and the non-US irradiation group in “Examination 1” (24-h irradiation). The amount of biofilm formed was significantly lower in the US irradiation group (US +) than in the non-US irradiation group (US−)