AYDIN, Metin, et al. “The Effect on Anastomotic Leakage of Serum Zn, Cu Levels and Cu-Zn Ratio”. Turkish Journal of Gastroenterology, vol. 8, no. 4, Jan. 1997, pp. 454-7, https://turkjgastroenterol.org/index.php/tjg/article/view/837.