Erratum: Sustained functional benefits after a single set of injections with abobotulinumtoxinA using a 2-mL injection volume in adults with cervical dystonia: 12- week results from a randomized, doubleblind, placebo-controlled phase 3b study (PLoS ONE (2021) 16:2 (e0245827) DOI: 10.1371/journal.pone.0245827)