1.
Comparison of the effects of adding fentanyl or remifentanil to propofol in colonoscopy sedoanalgesia on visual analog scale and recovery: A prospective double-blind study . Ann Med Res . 2021;26(3):0495-0498. Accessed October 22, 2025. http://www.annalsmedres.org/index.php/aomr/article/view/1318