Comparison of the efficacy of epidural blood patch and transnasal sphenopalatine ganglion block in the treatment of postspinal puncture headache. Ann Med Res [Internet]. 2023 Sep. 27 [cited 2025 Apr. 4];30(9):1106-11. Available from: http://annalsmedres.org/index.php/aomr/article/view/4521