A data-entry operator entered the data, 10% of which were cross-checked by the 2 investigators (MMR and NS). Statistical analysis was performed using SPSS version 15 (SPSS, Chicago, IL) and R Studio software (R Core Team [2013], Vienna, Austria). Data were presented as proportion, mean and standard deviation (SD) or median and interquartile range depending on the type and distribution. Normally distributed continuous data were analyzed using the unpaired t test. Categorical and nonparametric continuous data were analyzed using χ2 and Mann-Whitney U tests, respectively. Binary variables found significant in univariate analysis were entered into stepwise logistic regression and likelihood ratio tests for multivariate analysis. P values less than 0.05 were considered significant.

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