Syed, S., Qayoom, N., Naaz, S., Mushtaq, K., Mir, A. H., Bijli, A. H. and Ali, Z. (2017) “Comparison of post-dural puncture headache- incidence and severity in obstetric patients after spinal anesthesia for caesarean section with 25G and 27G quincke needle”, International Journal of Research in Medical Sciences, 5(2), pp. 596–600. doi: 10.18203/2320-6012.ijrms20170158.