The Relation between Inosine Triphosphatase Gene Variants and Anemia and Thrombocytopenia Induced by Combined Pegylated Interferon-Alfa and Ribavirin Therapy among Chronic Hepatitis C Patients in Egypt, HASSAN B. ABD EL-RAHEEM, MOSTAFA M. RAGHEB, YASUHITO TANAKA, FADIA M. ATTIA, MOHAMMAD F. HASSAN and NASHAAT M. SOLIMAN