1. Paediatric Clinical Nutrition Unit, Paediatric Department, Faculty of Medicine, Cairo University, Cairo, Egypt
2. Paediatric Surgery Section/Unit, Cairo University Hospitals (Cairo University Specialized Paediatric Hospital [CUSPH] & Cairo University Children’s Hospital [Abu El-Reesh El-Mounira]), Department of Surgery, Faculty of Medicine, Cairo University, Cairo, Egypt
3. Clinical Pathology Department, Faculty of Medicine, Cairo University, Cairo, Egypt
4. Cancer Epidemiology and Biostatistics, National Cancer Institute, Cairo University, Cairo, Egypt