Statistical analysis
Categorical data are presented as numbers and percentages, and continuous variables presented by median and range. Patients after PC+BT were compared to age-matched PEP+BT or BT alone.
Due to the small size of the study population, non parametric tests were used: Kruskal-Wallis-test, Mann-Whitney test and Spearman test (p<0.05 considered statistically significant), using IBM SPSS 24.0.