1. Department of Medical Microbiology and Immunology, Faculty of Medicine; Mansoura University; Mansoura Egypt
2. Graduate School of Medicine, Department of Transplant Surgery; Kyoto University Hospital; Kyoto Kyoto 606-8507 Japan
3. Laboratory for Human Tumor Viruses, Institute for Virus Research; Kyoto University; Kyoto Kyoto 606-8507 Japan
4. Hepatology Department; National Hepatology and Tropical Medicine Research Institute; Cairo Egypt