Statistical analysis.
Continuous variables following normal distribution were presented as mean ± standard deviations. Non-normally distributed variables were presented as median and range. Categorical variables were presented as counts and percentages. All data were analyzed with SPSS 23.0 statistical software (SPSS23, Chicago, IL, USA). A p -value of<0.05 was considered statistically significant. A 1-year Kaplan-Meier estimate of all-cause mortality was calculated for patients.