Address: 1Department of Pediatric Oncology, South Egypt Cancer Institute, Assiut University,
Assiut, Egypt, 2Department of Surgical Oncology, South Egypt Cancer Institute, Assiut
University, Assiut, Egypt and 3Department of Public Health and Community Medicine, Faculty
of Medicine, Assiut University, Assiut, Egypt Email: Nisreen M Khalifa -
nisreen_khalifa@hotmail.com; Doaa W Maximous - doaadavid@hotmail.com; Alaa A Abd-
Elsayed* - alaaawny@hotmail.com * Corresponding author ... Abstract Introduction