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 [Internet]. 2022 Jun. 8 [cited 2024 Dec. 22];16(05):310. Available from: https://pjmhsonline.com/index.php/pjmhs/article/view/1170