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  • This patient group was composed of 400 subjects (200 males and 200 females, aged 28 to 62 years with a mean age of 50.46±9.14 years; Table 1) that were recruited from the inpatient and outpatient clinical services at the First Affiliated Hospital of Xi'an Jiaotong University, the second Affiliated Hospital of Xi'an Jiaotong University and the Stomatology Hospital of Xi'an Jiaotong University.
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