Statistical analysis
SD
After testing for normality (Shapiro–Wilk test), the data were expressed as means ± SD and non-normally distributed data as median [interquartile range] or mean [95% CI], as appropriate. Measurements were calculated as means (± standard deviation). ANOVA was used to compare different groups. Non-parametric one-way ANOVA (Kruskal–Wallis test) was used for rating data. Pearson's chi-squared test was used to compare the categorised data in the groups. We set 