Institution: | 1. Ain Shams University, Pediatric Hospital, Hematology-Oncology, Cairo, Egypt;2. Pediatrics Department, National Research Center, Cairo, Egypt;3. Clinical Pathology National Research Center, Cairo, Egypt;1. Department of Colorectal Surgery, Chelsea & Westminster Hospital, London, UK;2. Department of Surgery and Cancer, Imperial College, London, UK;3. Department of Colorectal Surgery, Royal Marsden Hospital, London, UK |