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Serum testosterone levels (A), serum sex hormone binding globulin (SHBG) levels (B), free androgen index (FAI) (C), serum estradiol levels (D), 1 month before and 1, 3, 6, 12, and 24 months after bariatric surgery. *, P < 0.05 and **, P < 0.01 for change after surgery.
