Statistical analysis
Statistical analysis was performed with the assistance of the 			 Department of Biostatistics. Normally distributed continuous variables were 			 analyzed with the Student's t-test. Variables without a normal 			 distribution were analyzed with the Wilcoxon signed rank test. This study has 			 been approved by the Department of Pediatrics Research Committee and the King 			 Faisal Specialist Hospital and Research Centre's Research Advisory 			 Council.