title: Level 2 Observational Studies: A Practical Alternative to Randomized Trials in Plastic Surgery.
authors.affiliation: Dr Swanson is a plastic surgeon in private practice in Leawood, KS.
authors.forename: Eric
authors.initials: E
authors.lastname: Swanson
mesh_terms: D019274:Botulinum Toxins, Type A / Q000008:administration & dosage*; D005260:Female; D006801:Humans; D009465:Neuromuscular Agents / Q000008:administration & dosage*; D012629:Sebum / Q000378:metabolism*; D015595:Skin Aging / Q000187:drug effects*
chemical_list: D009465:Neuromuscular Agents; D019274:Botulinum Toxins, Type A