title: Head-to-head studies of botulinum toxin A in aesthetic medicine: which evidence is good enough?
authors.forename: Berthold
authors.initials: B
authors.lastname: Rzany
authors.forename: Alexander
authors.initials: A
authors.lastname: Nast
mesh_terms: D019274:Botulinum Toxins, Type A / Q000008:administration & dosage* / Q000627:therapeutic use; D004305:Dose-Response Relationship, Drug; D006801:Humans; D007273:Injections, Intramuscular; D009465:Neuromuscular Agents / Q000008:administration & dosage* / Q000627:therapeutic use; D016032:Randomized Controlled Trials as Topic; D019651:Plastic Surgery Procedures; D012107:Research Design; D015595:Skin Aging / Q000187:drug effects*; D016896:Treatment Outcome
chemical_list: D009465:Neuromuscular Agents; D019274:Botulinum Toxins, Type A