title: Met-analyses.
authors.forename: Paris P
authors.initials: PP
authors.lastname: Tekkis
mesh_terms: D003107:Colorectal Surgery; D013505:Digestive System Surgical Procedures / Q000009:adverse effects*; D017558:Elective Surgical Procedures / Q000009:adverse effects*; D006801:Humans; D015201:Meta-Analysis as Topic; D011300:Preoperative Care / Q000379:methods*