“A Comparison of Incidence of Post Dural Puncture Headache Using 25G Quincke and 25G Whitacre Needle in Obstetric Patients Undergoing Caesarean Section under Spinal Anesthesia”. 2021. Med Phoenix 6 (1): 28-31. https://doi.org/10.3126/medphoenix.v6i1.36732.