Original Article Neoadjuvant versus adjuvant imatinib in primary localized gastrointestinal stromal tumor Jiayu Ling, Lishuo Shi, Xingyu Cheng, Yang Fu, Ziqin Lin, Yandong Zhao, Zheqing Li, Jianwei Zhang, Huabin Hu, Yue Cai, Yanhong Deng