Ayub, Farrukh, Asrar Ahmad, Khalid Zaeem Aslam, and Irum Saleem. “Frequency of Headache With 25G or 27G Quincke Needles After Spinal Anesthesia in Patients Undergoing Elective Cesarean Section”. Anaesthesia, Pain & Intensive Care (January 19, 2019): 170-173. Accessed July 3, 2024. https://apicareonline.com/index.php/APIC/article/view/106.