Longitudinal effects of Botox injections on voice-related quality of life (V-RQOL) for patients with adductory spasmodic dysphonia: part II - Rubin,A.D.; Wodchis,W.P.; Spak,C.; Kileny,P.R.; Hogikyan,N.D. (Arch Otolaryngol Head Neck Surg, 2004)