He, Liang, Ying Ding, Huiyu Chen, Yanning Qian, and Zhong Li. “Butorphanol Pre-Treatment Prevents Myoclonus Induced by Etomidate”. Swiss Medical Weekly 144, no. 4142 (October 5, 2014): w14042. Accessed June 5, 2023. https://smw.ch/index.php/smw/article/view/3261.