The BSAE SG. Preemptive Analgesic Efficacy of Tramadol, Butorphanol, and Flurbiprofen in Lumpectomy: A Randomized, Controlled and Double-blind Trial. Sci Insights [Internet]. 2015 Feb. 22 [cited 2026 Apr. 17];11(2):322-9. Available from: https://bonoi.org/index.php/si/article/view/180