title: Author's response.
authors.affiliation: Giessen, Germany.
authors.forename: Hans
authors.initials: H
authors.lastname: Pancherz
mesh_terms: D005260:Female; D006801:Humans; D008297:Male; D003765:Models, Dental / Q000706:statistics & numerical data*; D017289:Orthodontic Appliances, Functional / Q000706:statistics & numerical data*