Outcome Evaluation
A comprehensive evaluation of the curative effect was carried out in all cases one month after surgical operation. GRBAS (grade, roughness, breathiness, asthenia, strain) is the scale of the Japan Society of Logopedics and Phoniatrics, which gives a 4-point grading scale (0, normal; 1, slight deviance; 2, moderate deviance; 3, severe deviance) for perceptual analysis of voice. We used GRB as evaluation system to rating the patient cases which were obtained preoperatively and postoperatively.14 Videolaryngostroboscopy (VLS) examination was performed preoperatively and postoperatively when the patient sustained phonation of the vowel /i/. The main parameters examined were including the degree of the vocal fold edge profile, glottic closure, and mucosal wave. For each VLS parameter, a 4-point grading scale mentioned above was used. According to the accumulated points obtained after evaluation, each group was assigned into three grading scale (0, normal; ≤2, slight deviance; ≥3, deviance).15,16