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The images were transferred digitally to a picture archiving and communication system (PACS). The radiographic magnification of all the measurements was corrected using the PACS ruler and the assessment was performed on a 21.3-inch monitor (Totoku CCL358) in portrait mode using the GE Centricity software. The minimum differences that the software could detect were 0.1° in angle and 0.1 mm in length. All the measurements and calculations were conducted by a single-qualified observer (JRC), who had accepted the measurement training. All the parameters were measured three times on different days by each observer, and the average was taken as the final data. The intra- and interobserver reliabilities of all measurements were assessed using the intraclass correlation coefficient, the values of which were greater than 0.8.

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