title: Why don't all individuals who undergo dura mater/arachnoid puncture develop postdural puncture headache?
authors.affiliation: Neurology and Neurosurgery Unit, Department of Neuropsychiatry, Federal University of Pernambuco, Recife, Brazil.
authors.forename: Marcelo M
authors.initials: MM
authors.lastname: Valenca
authors.affiliation: Neurology and Neurosurgery Unit, Department of Neuropsychiatry, Federal University of Pernambuco, Recife, Brazil.
authors.forename: Jane A
authors.initials: JA
authors.lastname: Amorim
authors.affiliation: Neurology and Neurosurgery Unit, Department of Neuropsychiatry, Federal University of Pernambuco, Recife, Brazil.
authors.forename: Tiago P
authors.initials: TP
authors.lastname: Moura
keywords: Anesthesia, Spinal; Dura Mater; Post-Dural Puncture Headache