Dias Cicarelli , D.; Frerichs, E.; Martins Benseñor, F. E. . Incidence of Neurological Complications and Post-Dural Puncture Headache After Regional Anesthesia in Obstetric Practice: A Retrospective Study of 2399 Patients. Colomb. J. Anesthesiol. 2014, 42, 28–32.