Long-term safety and efficacy data on botulinum toxin type A: an injection for sialorrhea.
Chan KH, Liang C, Wilson P, Higgins D, Allen GC. Long-term safety and efficacy data on botulinum toxin type A: an injection for sialorrhea. JAMA Otolaryngol Head Neck Surg. 2013 Feb; 139(2):134-8.