Fig. 3

Overall survival analysis on total cohort stratified by the number of risk factor related to overall survival. (A) No risk factor; (B) One risk factor; (C) Two risk factors; (D) More than two risk factors. Overall survival analysis on the cohort after propensity score matching stratified by the number of risk factor related to overall survival. (E) No risk factor; (F) One risk factor; (G) Two risk factors; (H) More than two risk factors.