title: The role of propensity scores should be discouraged when there is too little and too early of new surgical techniques.
authors.forename: Jeffrey H
authors.initials: JH
authors.lastname: Shuhaiber
mesh_terms: D016022:Case-Control Studies; D015986:Confounding Factors, Epidemiologic; D003627:Data Interpretation, Statistical; D013502:General Surgery / Q000379:methods* / Q000639:trends; D006801:Humans; D017063:Outcome Assessment, Health Care; D011237:Predictive Value of Tests; D015983:Selection Bias; D012680:Sensitivity and Specificity