Figure 2 : Flowchart describing the origin of patients in each group.

* - group compared in the analysis. ERAS: enhanced recovery after surgery guidelines for elective colonic surgery; PCIA: patient controlled intravenous analgesia.

Koolwijk et al.Journal of Anesthesiology and Clinical Science  2013 2:27DOI : 10.7243/2049-9752-2-27