Figure 1.
(A) AS group: a patient with AS, 28 years old, male, BMI: 15.34, ESR: 41 mm/h, HLA-B27 (+); (B) No-AS group: a patient with aseptic femoral head necrosis, 43 years old, male, BMI: 24.564, ESR: 63 mm/h.
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