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Changes in the objective parameters during follow-up in the conventional open thyroidectomy group. PreOp, preoperatively; Post 1M, 1 month postoperatively; Post 6M, 6 months postoperatively; MPT, maximum phonation time (second); Max/Mean/Min F0/20, maximum/mean/minimum fundamental frequency/20; HNR/10, harmonics-to-noise ratio (dB)/10; CQ/10, contact quotient (%) of the electroglottograph/10. *P<0.05, using paired t-test, PreOp vs. Post 1M.
