Retrospective Cohort Study
Copyright ©The Author(s) 2019.
World J Gastrointest Surg. Apr 27, 2019; 11(4): 218-228
Published online Apr 27, 2019. doi: 10.4240/wjgs.v11.i4.218
Figure 1
Figure 1 Flow chart of study cohort. ACS-NSQIP: American College of Surgeons National Surgical Quality Improvement Program.