<qa>  What was the p value of Fishers Exact test?The Predictive Analytics Software PASW version 18.0 for Windows program SPSS Inc., Chicago, USA was used for statistical analysis. Descriptive statistics were expressed as number and percentage for categorical variables and as mean, standard deviation, median, the 25th percentile Q1: the first quartile, and the 75th percentile Q3: the third quartile for numerical variables. For numerical variables, independent multiple group comparisons were performed by Kruskal-Wallis test for non-normally distributed data and by t-test for normally distributed data. Mann-Whitney U test with Bonferroni correction was used for subgroup analysis of non-normally distributed numerical variables. For multiple group comparisons of categorical variables, Chi-square test statistics was used in case the assumption of chi-square test was met, whereas Fishers Exact test was used in case the assumption of chi-square test was not met. A p value of 0.05 was considered statistically significant. 