Botulinum Toxins, Type ANeuromuscular AgentsTorticollisBlepharospasmSialorrheaHemifacial SpasmAnti-Dyskinesia AgentsTherapeutic EquivalencyCosmetic TechniquesEsophageal AchalasiaDystoniaSpasmFacial MusclesBotulinum ToxinsHyperhidrosisInjections, IntramuscularInjectionsNeurotoxinsDouble-Blind MethodTreatment OutcomeCross-Over StudiesPainPain MeasurementDose-Response Relationship, DrugProspective StudiesSeverity of Illness Index