MOESM1 of GC-PROM: validation of a patient-reported outcomes measure for Chinese patients with gastric cancer HuXiaojuan ZhaoFen YuHongmei LuoYanhong LiuJinchun ZhangYanbo 2020 Additional file 1. Final version of GC-PROM. After two item-selection process based on classical test theory and item response theory, the final GC-PROM consisted of 38 items. It described which items were included in the final scale.