title: Frontal sinus approach: the 'vertical bar' concept.
authors: A
authors: A
authors: Stamm
authors: J F
authors: JF
authors: Nogueira
authors: R R
authors: RR
authors: Americo
authors: M L
authors: ML
authors: Solferini Silva
mesh_terms: D002983:Clinical Competence / Q000592:standards; D004724:Endoscopy / Q000379:methods*; D005626:Frontal Sinus / Q000033:anatomy & histology / Q000601:surgery*; D006801:Humans; D007431:Intraoperative Complications / Q000517:prevention & control