Haider Ali Khan, Arsalan Jamil, Zahid Aziz Soomro, Tahir Ali, M. Aneeque Alam Khan, Asim Javed. “Effect of Valsalva Maneuver in Attenuating Spinal Needle Puncture Pain”. Pakistan Journal of Medical & Health Sciences 16, no. 05 (June 8, 2022): 310. Accessed December 22, 2024. https://pjmhsonline.com/index.php/pjmhs/article/view/1170.