Inappropriate lack of stratification by elective or emergency operation status and missing information on important confounders.
Lyratzopoulos
Georgios
G
D019643:Arthroplasty, Replacement / Q000145:classification / Q000193:education / Q000706:statistics & numerical data*; D015986:Confounding Factors, Epidemiologic; D017558:Elective Surgical Procedures; D004630:Emergencies / Q000145:classification; D004739:England; D006801:Humans; D015201:Meta-Analysis as Topic; D018570:Risk Assessment; D013503:Surgery Department, Hospital / Q000592:standards* / Q000706:statistics & numerical data*