(a) Unadjusted Kaplan-Meier patient survival curves for liver transplant alone (LTA) versus simultaneous liver-kidney transplantations (SLK) recipients not on dialysis either at listing or transplant, and serum creatinine <2 mg/dl at transplant (LK1), after the propensity score matching (UNOS data between 2003 and 2013 in the USA). (b) Unadjusted Kaplan-Meier patient survival curves for LTA versus SLK recipients not on dialysis either at listing or transplant and serum creatinine ≥2 mg/dl at transplant (LK2), after the propensity score matching (UNOS data between 2003 and 2013 in the USA). (c) Unadjusted Kaplan-Meier patient survival curves for LTA versus SLK recipients not on dialysis at listing but on dialysis at transplant (LK3), after the propensity score matching (UNOS data between 2003 and 2013 in the USA). (d) Unadjusted Kaplan-Meier patient survival curves for LTA versus SLK recipients on dialysis at listing and transplant (LK4), after the propensity score matching (UNOS data between 2003 and 2013 in the USA). UNOS, United Network for Organ Sharing.