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Multivariate analysis for short-term complications. Type of surgery was included in the model as covariate. Additional covariates, including age at baseline, diabetes (yes/no), smoking (yes/no/prior), nodal stage (pNx/pN0/pN1/pN2/pN3), T stage (pTis/pT0/pT1/pT2/pT3/pT4), and margin (+/–), were entered into the model based on the stepwise selection. Twenty-nine observations were deleted due to missing values.
