Positive Effect of Higher Adult Body Mass Index on Overall Survival of Digestive System Cancers Except Pancreatic Cancer: A Systematic Review and Meta-Analysis

Figure 1

Flowchart of study selection in this meta-analysis. 1634 studies were preretrieved in accordance with the established search strategies. Then 53 studies that may meet the requirements were further screened out through browsing the titles and abstracts. After reading the full texts of 53 studies, 34 eligible studies were finally included in this meta-analysis according to the criteria.