“A Cross-Sectional Observational Study to Establish the Association Between ECOG Performance Status and Age and Administration of Doublet or Triplet Chemotherapy Containing Xeloda® (capecitabine) in Advanced Gastric Cancer Patients”. 2014. European Journal of Oncology and Environmental Health 18 (4): 173-80. https://mattioli1885journals.com/index.php/EJOEH/article/view/2443.