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Schema of the study. Baseline tests including thyroid function tests, questionnaires, and functional brain magnetic resonance imaging (fMRI) were done before thyroid hormone withdrawal (THW). Thyroxine was discontinued for four weeks, and triiodothyronine was administered for the initial two weeks. Thus, the duration of THW was two weeks. Follow-up examinations using the same tests were repeated after the two-week period had elapsed.
