Osama Mahmoud El-Asheer Ahmed • Professor of Pediatrics, Faculty of Medicine, Assiut University • Head of Clinical Nutrition Unit ¬¬, Assiut University Children's Hospital, Egypt. • President of Upper Egypt Society of Clinical Nutrition and Metabolism • Consultant of Pediatrics, Police Hospital, Assiut • Moderator and attendee in various workshops and conferences related to field of clinical nutrition in pediatrics • Clinical nutrition researcher with local and international publication • Teaching pediatrics and clinical nutrition in Pediatric department, Faculty of Medicine, Assiut University for under graduate and postgraduate students • Supervision of master degree and PhD thesis in Pediatrics, Assiut University; related to the field of Pediatrics, Pediatric clinical nutrition and nutritional disorders • Coordinator and instructor of pediatric nutrition workshops in Assiut university and ministry of health Email: asheer1970@gmail.com Osama_elasheer@med.au.edu.eg Address: Assiut University Children Hospital, Assiut, Egypt.