Different Regimens of Vitamin D in Treatment of Children With Chronic Liver Disease

o Fibroscan: as a non-invasive imaging study for measuring liver cirrhosis by transducer probe-induced elastic share wave that propagates through liver tissue to measure its velocity. It is a promising non-invasive method for detection of cirrhosis in patients with chronic liver disease. Therefore, fibroscan can be used regarding the decision of treatment and follow-up of patients with cirrhosis for screening and detection of the complications . In our study the investigators will assess liver fibrosis before and after vitamin D therapy using fibroscan.