Randomized controlled study~Including 40 patients in each arm~Treatment: anti-adhesion barrier apply on the thyroidectomy space~Control: No use of anti-adhesion barrier~Primary outcome: VHI-30 (Voice handicap index)~Secondary outcome: findings from stroboscopy, CSL (Computerize Speech Lab)~Outcome measurement: preoperative, post-operative 3 months, post-operative 9 months.
To determine whether the use of anti-adhesion barrier after thyroid surgery can prevent the voice changes after surgery, using objective voice-related indicators.