title: Identification of the epidural space: air or saline?
authors.forename: Carlos L
authors.initials: CL
authors.lastname: Errando
mesh_terms: D000328:Adult; D015360:Analgesia, Epidural / Q000009:adverse effects / Q000379:methods*; D004824:Epidural Space / Q000033:anatomy & histology*; D006801:Humans