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The subjects were then randomly distributed into six experimental groups: sixteen subjects were implanted subcutaneously in the neck region with two 20 mm-long Silastic™ tubes (Silclear ™ Tubing, Degania Silicone, 1.57 mm i.d., 2.41 mm o.d.) that were empty (CX group, n = 7) or filled with crystalline testosterone (Sigma, T group, n = 9).
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