Free and total serum testosterone levels as well as Sex Hormone Binding Globulin (SHBG) levels were either obtained from patients’ files or assessed pre-operatively using enzyme linked immunoassay kit supplied by Elabscience, USA. Levels were re-assessed 6 months and 1 year post-operative. Free androgen index (FAI) was calculated by dividing total serum testosterone value by the value of sex hormone binding globulin (SHBG) and then multiplying by a constant (1 0 0).
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