Department of Gastroenterological Surgery,Peking University People's Hospital,Beijing 100044,China;
Evidence-Based Nursing Center,School of Nursing,Lanzhou University,Lanzhou 730000,Gansu Province,China;
Evidence Based Medicine Center,School of Basic Medical Science of Lanzhou University,Lanzhou 730000,Gansu Province,China;
Gastrointestinal stromal tumor; Multiple; Pooling analysis; Cross sectional study; Evidence and gap map;