Wang, Sheng-Fu, et al. “A Valuable Endoscopic Tattooing Method for Early Gastric Cancer Localization before Laparoscopic Surgery”. Archives of Clinical and Biomedical Research, vol. 6, no. 3, May 2022, pp. 466-80, https://fortunejournals.org/ojs/index.php/acbr/article/view/14928.