Khawaja, Shahid Shafi, Muhammad Yasir Rafiq, Huma Rafi, Shahzad Ali, and Abu Sufyan. 2019. “TRANSNASAL SPHENOPALATINE GANGLION BLOCK, AN INNOVATIVE MODALITY FOR TREATMENT OF POST DURAL PUNCTURAL HEADACHE”. Pakistan Armed Forces Medical Journal 69 (2): 403-07. https://pafmj.org/PAFMJ/article/view/2763.