Impact of PG-SGA-assessed malnutrition stratification on clinical outcomes in advanced gastrointestinal malignancies: a retrospective cohort study. - Zhuang, Pei; Chen, Jun-xuan; Xia, Bing; Chen, Xiao-su; Chen, Xiao-tian; Li, Li; Zhu, Ting; Wang, Shu-an; Li, Qing-yan (BMC Gastroenterology, 2025)