1 Department of Internal Medicine, Endocrinology Unit, Faculty of Medicine, University of Alexandria, 3 Amir Omar Street, Moharam Bek, Alexandria, 21557, Egypt. tareksalemalexuni@yahoo.com.
2 Department of Biotechnology, Institute of Graduate Studies and Research, Alexandria University, Alexandria, Egypt.
3 Department of Clinical & Chemical Pathology, Faculty of Medicine, Alexandria University, Alexandria, Egypt.