D. Dias Cicarelli, E. Frerichs, and F. E. . Martins Benseñor, “ Incidence of neurological complications and post-dural puncture headache after regional anesthesia in obstetric practice: A retrospective study of 2399 patients”, Colomb. J. Anesthesiol., vol. 42, no. 1, pp. 28–32, Jan. 2014.