Muyphuag, Bunlung, and Vichit Viriyaroj. 2017. “The efficacy of anesthesia choice for lateral internal sphincterotomy: a comparison of local anesthesia and regional anesthesia”. Journal of Medicine and Health Sciences 19 (1):29-35. https://he01.tci-thaijo.org/index.php/jmhs/article/view/98571.