Chenhan Zhong, Xuefeng Fang, Lizhen Zhu, Dan Li, Jinlong Tang, Ying Yuan, and Ying Yuan. 2019. “Report of Two Cases and a Systematic Review of Breast Cancer With Gastrointestinal Metastasis”. Turkish Journal of Gastroenterology 30 (11):997-1000. https://turkjgastroenterol.avesjournals.com/index.php/tjg/article/view/3812.