1. Pediatric specialist in Belkas Central Hospital, Ministry of health and population, Dakahlia, Egypt
2. Industrial Medicine and Occupational Health Department of Public Health and Community medicine department, Faculty of Medicine, Mansoura University, Mansoura, Egypt
3. Professor of pediatric medicine, Faculty of Medicine, Mansoura University, Mansoura, Egypt
4. Pediatric Hematology/Oncology and Bone Marrow Transplantation Unit, Department of Pediatrics, Mansoura Research Center For Cord Stem Cells, Faculty of Medicine, Mansoura University, Mansoura, Egypt