Erratum: Correction: Field, M. et al. AbobotulinumtoxinA (Dysport A® ), OnabotulinumtoxinA (Botox A® ), and IncobotulinumtoxinA (Xeomin A® ) Neurotoxin Content and Potential Implications for Duration of Response in Patients (Toxins (2018) 10 12 PII: E115)