2.3 Statistical analysis
Data analysis was performed using SPSS v.19 (IBM, Armonk NY). Descriptive data was expressed as mean ± standard deviation (SD) unless otherwise stated. One-way ANOVA was used for analysis of normally-distributed variables. Kruskal-Wallis test was used for non-normally distributed data. Categorical data was analyzed using Chi-square or Fisher‘s exact test. A value of P <0.05 was considered statistically significant. Likert scale scores were summarized as ordinal approximations of a continuous measure26,27.