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Figure 1: Positions of the dentist, the subject, and microphone during noise recording: (a) dentist, (b) subject, (c) microphone 10 cm away from subject's ear (unit: cm)

Figure 1: Positions of the dentist, the subject, and microphone during noise recording: (a) dentist, (b) subject, (c) microphone 10 cm away from subject's ear (unit: cm)