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The stereomicroscopic on-site evaluation procedure. A stereomicroscope (×20) was used to measure each fragment of the observed stereomicroscopically visible white core (SVWC) length. The scale on the screen of the microscope monitor was used to determine whether the sum of SVWC lengths in a sample met the cutoff value (≥4 mm). The areas encircled in black were defined as SVWC, and the total length exceeded 4 mm.
