Observational Study
Copyright ©The Author(s) 2021.
World J Gastrointest Surg. Aug 27, 2021; 13(8): 859-870
Published online Aug 27, 2021. doi: 10.4240/wjgs.v13.i8.859
Figure 1
Figure 1 Cohort selection. ED: Emergency departments; ICD: International classification of diseases.