Botulinum neurotoxin for head and neck disorders [electronic resource] / Andrew Blitzer, MD, DDS, FACS, professor emeritus of otolaryngology--head and neck surgery, Columbia University College of Physicians and Surgeons, adjunct professor of neurology, Icahn School of Medicine at Mt. Sinai, director, NY Center for Voice and Swallowing Disorders, co-founder and director of research, ADN International, New York, New York, Brian E. Benson, MD, FACS, chairman, Department of Otolaryngology--Head and Neck Surgery, Hackensack Meridian School of Medicine, Hackensack, New Jersey, Diana N. Kirke, MBBS, MPhil, FRACS, assistant professor, Department of Otolaryngology--Head and Neck Surgery, Icahn School of Medicine at Mount Sinai, New York, New York.